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{{Infobox CVG|bgcolour = #FF974D|title = Half-Life 2: Episode One|image = |developer = Valve Corporation|distributor = [Electronic Arts Worldwide
Unalis in Taiwan and Vivendi Universal Games (incl. [High dynamic range rendering)|released = June 1 2006|modes = [Single player: Mature 17+
[Office of Film and Literature Classification (Australia): MA 15+
PEGI: 16+, BBFC: 15
BPjM: 18] (Windows), Xbox 360, PlayStation 3 and [Steam (content delivery), Blu-Ray, [DirectX 9.0c or higher (included), Internet Connection (Broadband or better recommended)] and Mouse (computing)-->Half-Life 2: Episode One is the first of a trilogy of Episodic games for the 2004 in video gaming first-person shooter game, Half-Life 2. It was developed by the Valve Corporation and was released on June 1, 2006, receiving a positive critical reaction. The episode is a stand-alone game; while a continuation of Half-Life 2, it does not require the original game to be installed or registered to a user's Steam (content delivery) account to play. It takes advantage of several major upgrades to the Source engine since the release of Half-Life 2, primarily its high dynamic range rendering capabilities and the upgraded facial animation system.

The episode takes place immediately after the end of Half-Life 2, in and around the war-torn setting of City 17. Episode One continues to follow scientist Gordon Freeman and his companion Alyx Vance as they deal with the events of Half-Life 2 and humanity's continuing struggle against the Combine (Half-Life 2).

Valve views episodes One through Three as tantamount to a stand alone release, essentially Half-Life 3 divided into three episodes. Episode One was released together with Half-Life Deathmatch: Source, a port of the original Half-Life's multiplayer, which doubles as ''Episode One'''s multiplayer component. The retail copies of Episode One also come with Half-Life 2 Deathmatch for those who have not previously purchased the latter title. Episode One is also available as part of a bundle package known as The Orange Box, which also includes Half-Life 2, Half-Life 2: Episode Two, Team Fortress 2 and Portal (video game).

Plot talks on a communication screen with Isaac Kleiner and Eli Vance outside the Citadel.The series of following events in Half-Life 2, Episode One starts out after the explosion of the List of Combine non-combat technology in Half-Life 2#The Citadel's dark energy nuclear fusion reactor from which Gordon was extracted by the G-Man and Alyx Vance was left behind. As time stops, several Vortigaunts appear and rescue Alyx from the blast. The G-Man (Half-Life) is then seen walking toward Gordon Freeman. As he opens his mouth to speak, he is distracted by blue lights and is separated from Gordon by another group of Vortigaunts - much to his displeasure.G-Man: We'll see...about that (Half-Life 2: Episode One) Valve, 2006 More Vortigaunts then surround and teleport Gordon.

Gordon wakes up outside the Citadel, buried under a pile of rubble. Dog (Half-Life 2) removes these rocks, and Gordon is reunited with Alyx. Alyx contacts Eli Vance and Isaac Kleiner, who have managed to escape the city, and is informed that the Citadel's core is at risk of exploding at any moment.Kleiner: Our remote sensors indicate that the process is accelerating toward a dark-energy flare. Anyone left in the vicinity will be subjected to energetic events whose effects are beyond my powers of speculation! (Half-Life 2: Episode One) Valve, 2006 Kleiner states that the explosion could be large enough to level the whole of City 17, and that the only way for them to survive would be to re-enter the Citadel and slow the core's progression toward meltdown. Eli reluctantly agrees when he sees no other option. Alyx and Gordon re-enter the Citadel to try to stabilize the core.Kleiner: Well...nothing short of a direct intervention could possibly retard the reaction. (Half-Life 2: Episode One) Valve, 2006

They discover a large chamber with a recording of the discussion between a Combine (Half-Life 2)#Combine Advisors and Wallace Breen before Gordon chased him down in Half-Life 2.Breen: It's me you should be worrying about. I can still deliver Earth, but not without your help... The portal destination is untenable, surely you can set the relay elsewhere. There's no way I can survive in that environment... A host body?! You must be joking! I can't possibly- Oh alright, damn it! If that's what it takes. Just hurry, he's right behind me! (Half-Life 2: Episode One) Valve, 2006 The recording ends, interrupted by a brief image of a Combine Advisor. Alyx and Gordon are then subject to psychic blasts as a List of humanoid and synthetic Combine in Half-Life 2#Combine pod is transported through a tube in the control room.

Gordon and Alyx are successful in re-engaging the reactor's containment system, delaying the explosion. Alyx subsequently discovers that the Combine are deliberately accelerating the destruction of the Citadel to send a message off-world. She makes a copy of the message packet, ensuring that the Combine make them their prime target.Alyx: I can't tell what the packet contains, but it's important enough that they're willing to sacrifice the whole citadel to send it off. We need to get it back to my dad and Doctor Kleiner at the outpost right away. I've been pulling down a copy. Whatever it is, I have a feeling it's bad news for all of us. (Half-Life 2: Episode One) Valve, 2006 In addition, Alyx locates and downloads a transmission from Dr. Judith Mossman describing a certain project she has located, before being cut off by a Combine attack.Mossman: I'm fairly sure I've pinned down the location of the project. It's hard to say how much of it might have survived intact or if there is anything remaining that could compromise our work; if it were discovered by the Combine. We'll need to take a close look at it, of course, but I should be able to give a better opinion within a few hours. If the site is where we think it is, it should be no more than... I'm gonna have to cut this short, we may have been spotted.. (Half-Life 2: Episode One) Valve, 2006 Alyx and Gordon then board a List of Combine non-combat technology in Half-Life 2#Razor Trains to escape the Citadel.

The train derails underground and the duo fight to the surface. Dr. Kleiner appears on the screens that Breen once used to pass out propaganda, giving out useful updates to the evacuating citizens about the latest turn of events as well as reiterating the Citadel's imminent collapse.Kleiner: Therefore, I repeat, evacuate City 17 at once if not sooner! I cannot state this without enough undue emphasis. (Half-Life 2: Episode One) Valve, 2006 The city is in disarray, with Antlions and Headcrabs running rampant throughout the ruins created by the ongoing conflict between the Combine and the Resistance.

Alyx and Gordon eventually meet up with Barney Calhoun and a group of other survivors who are preparing to move on a train station in order to escape City 17.Barney: You guys know about the evacuation trains, right? Alyx: Yeah. Barney: Yeah, well, we've been planning to make a push on the train station. (Half-Life 2: Episode One) Valve, 2006 Gordon and Alyx split up from the group and move through a abandonment hospital to draw the Combine forces away from the refugees.Alyx: If Gordon and I took a separate route, we could draw the Combine away from you. (Half-Life 2: Episode One) Valve, 2006 Upon reuniting with Barney at the train station, Alyx and Gordon work to move the citizens to the trains while facing Combine opposition.Barney: If you can keep them safe and provide cover, we might actually stand a chance of reaching the escape trains Alyx: Sounds good. (Half-Life 2: Episode One) Valve, 2006 They decide to stay behind to lure the Combine away from Barney and the citizens as they make their escape.Barney: You guys coming? Alyx: Go on Barney! They're not after you. Gordon and I will draw their attention while you get the others away from here. (Half-Life 2: Episode One) Valve, 2006

The duo reprogram another train and board the caboose. As the train heads away, the Citadel is visible in the background with the reactor core about to explode, and the Combine's message is sent.Alyx: Oh my God! The message is going out. (Half-Life 2: Episode One) Valve, 2006 Several Advisor pods are ejected from the Citadel as it detonates. The shockwave from the exploding Citadel causes wreckage to fly toward the train, and the screen fades as the blast overtakes the train. The last thing that the player hears is the twisting of metal and Alyx whispering Gordon's name.

The fate of Alyx and Gordon is revealed in the sequel Half-Life 2: Episode Two.

Gameplay As a direct continuation of Half-Life 2, no significant changes to the gameplay were undertaken. As in Half-Life and Half-Life 2 players make their way through a linear series of level (computer and video games), encountering various different enemies and allies. The gameplay is broken up between combat orientated challenges and puzzles; these include physics-based puzzles. Episode One also integrates Tutorial#Computing like tasks into the story itself as in the previous games in order to familiarize the player to any new gameplay mechanics, such as the ability to re-program rollermines, without breaking immersion. Like Half-Life 2, the gravity gun continues to play a crucial function throughout the game, granting the player extensive use of physics in combat and puzzle-solving.

One significant gameplay addition was the enhancement of co-operative play with friendly NPCs, most notably with the character of Alyx Vance - her AI was specifically designed for co-op play in Episode One so that she would compliment as opposed to hinder the player's abilities and prove a useful ally in combat and puzzle solving situations, while being specially programmed to avoid performing too many mechanical or repetitious actions such as repeating lines of dialogue or performing certain routines in combat situations, thus separating her from the more generic NPC allies the player fought beside in the later levels of Half-Life 2.Half-Life 2: Episode One, Chapter I: Undue Alarm, Developers commentary Examples of this co-operative gameplay include combat in the darker underground levels mid-game where the player can use their flashlight to help Alyx spot and kill oncoming enemies and in doing so conserve their ammunition,Half-Life 2: Episode One, Chapter III: Lowlife, Developers commentary as well as in gameplay sections late in the game where Alyx provides covering fire while the player travels to a certain area or performs certain actions, therefore keeping the player safe while they undertake their tasks.Half-Life 2: Episode One, Chapter IV: Urban Flight, Developers commentary The developers described Alyx's programming for Episode One as a "personality code" as opposed to an "AI code", further emphasising their attention to creating a unique and believable companion.

Enemies such as List of humanoid and synthetic Combine in Half-Life 2#Stalker and areas of the Citadel glimpsed at the end of Half-Life 2 are encountered and explored by the player. Other new additions include the Headcrab#Zombine, List of humanoid and synthetic Combine in Half-Life 2#Combine pod and List of humanoid and synthetic Combine in Half-Life 2#Hunter; the latter two introduced as set-up for Half-Life 2: Episode Two are only briefly interacted with. While new creatures were added, there were no additions to the game's current weapon arsenal.

While no entirely new locales were introduced for Episode One, large alterations were made to the appearance of both City 17 and the Citadel from the end of Half-Life 2 to reflect the changing shape of the world and to serve as a story reminder to the player how their actions have affected the greater whole. The Citadel has degenerated from the cold, alien and imposing fortress of the previous game to an extremely unstable state, providing a visual cue to remind the player of the catastrophic damage they inflicted, to allow for new gameplay elements that accentuate the new dangers that come with the Citadel's imminent collapse and to serve a thematic purpose in highlighting the weakening of the Combine's dominance. Likewise, City 17 has been altered to reflect the aftermath of the resistance's open rebellion, with vast swathes of destroyed buildings and the introduction of foes previously kept outside its confines in Half-Life 2 in order to further emphasise the scale of the uprising. The introduction of the Zombine enemy, while providing a new dynamic in the game's enemy menagerie also serves a story purpose in showcasing the Combine's loss of control. Valve stated that they were interested in re-using concepts and providing twists on them - describing it as an important part of their philosophy to challenge the player's familiarity with previously encountered locations and enemies. An example of this is the use of the Citadel as constant presence in the episode's backgrounds - in Half-Life 2 it was clearly defined as the player's ultimate destination and where they must battle to, but now it is a source of impending disaster and the point from which the player must get the farthest from.

Development Valve explained that the focus of Episode One was character development, in particular that of Gordon Freeman female sidekick and friend Alyx Vance, to the extent that she accompanies the player for virtually the entire game. Project lead Robin Walker discussed the thinking behind this approach in the episode’s announcement article in the May 2005 issue of PC Gamer'’ "It's kind of ironic that despite so much of the theme of Half-Life 2 being about other characters and other people, you spent most of the game alone".

Lead writer Marc Laidlaw expanded further on the game's premise in the same article:

After some initial confusion, sparked partly with an attempt at humour by PC Gamer UK, which suggested that Alyx was Episode One's playable character, it was confirmed that players would indeed play as Gordon Freeman – unlike the original Half-Life expansion packs, which all dealt with different characters. Valve explained their desire to develop Episode One in-house as opposed to working with outside contractors as with previous expansions as a decision based on their comfort with the technology and construction tools of Half-Life 2, as well as their enjoyment of working on Half-Life 2 content.

Originally called Half-Life 2: Aftermath, the expansion was renamed to Episode One as an indication of Valve's confidence with their episodic structure, an implication confirmed in February and May of 2006 with news of a trilogy of episodes covering the present story arc. While the plots and dialogue of Half-Life and Half-Life 2 were written solely by Valve's in-house writer Marc Laidlaw, the "Half-Life 2 Episodes" are Collaborative writing by Laidlaw, Chet Faliszek and Erik Wolpaw with Laidlaw retaining overall leadership of the group.

As the character of Alyx accompanies the player for the vast majority of Episode One aiding in puzzle solving and combat situations, Valve made major modifications to her AI throughout development that allowed her to react to the players actions - such as commentating on objects the player manipulates or obstacles they have overcome. She also acts as an important device in both plot exposition and directing the player's journey, often vocalizing what the player is required to do next in order to progress. The developers explained a large part of their focus was creating not only a believable companion for the player, but also one that did not obstruct the player's actions; allowing them to dictate their own pace and method of overcoming any challenges faced without being hindered - this meant often scaling back Alyx's input and dialogue during the player's journey so that they would not feel pressured to progress and consequently object to her presence. The developers also placed what they described as 'hero moments' throughout the game that allow the player to single-handedly overcome certain obstacles, such as particularly challenging enemies, with Alyx taking the role of an observer and giving the player praise and adulation for their heroic feats.Half-Life 2: Episode One, Chapter V: Exit 17, Developers commentary Playtesters were used extensively by the developers throughout the entirey of the game's creation in order for Valve to continually gauge the effectiveness of ingame scenarios as well as the difficulty.

The game runs on an incrementally upgraded version of Valve's proprietary Source engine, and features both the engine's high dynamic range rendering capabilities, and a new version of its Source engine#Facial Animation 2 technology.Half-Life 2: Episode One, Chapter II: Direct Intervention, Developers commentary Upgrades to enemy AI allow Combine soldiers to utilize tactics previously unavailable to them, in particular the ability to crouch while being fired upon in order to "duck" underneath the player's line of fire. This feature is showcased to the utmost for the first time in the large street battle the player progresses through before entering the rebel safehouse in the game's fourth chapter. It also features the commentary node system debuted in the Half-Life 2: Lost Coast technology demo.

Episode One retailed at launch for $19.95 in the U.S. and is currently available over Valve's Steam (content delivery) for $9.95 USD. The game is also being distributed through traditional retail channels by Electronic Arts both as a standalone and as part of the Half-Life 2: Platinum Collection. The game became available for pre-load and pre-purchase through Steam on May 1 2006, with Half-Life: Source and Half-Life 2: Deathmatch immediately available for play as part of the package. Episode One is also included in the PC, Xbox 360 and Playstation 3 versions of The Orange Box.

Reception Critical response Critical and public response to Episode One was broadly positive, with some reviewers praising the game for having more intricate, well-paced gameplay than the acclaimed Half-Life 2. The game's interactivity, particularly in the shape of the character of Alyx and her reactions to the player's actions and the events of the game, has also received praise. PC Gamer magazine gave an 85% in the US edition, summarizing that "...while this inaugural episode may not be the essential FPS that Half-Life 2 is, I can't imagine any shooter fan who'd want to miss it". The game received 90% in the UK edition, which directed particular praise on the balance between puzzle orientated and action orientated challenges throughout the game. In Australia, the magazine PC Powerplay awarded the game with a rarely seen 10/10. Edge (magazine) gave the game 8 out of 10, praising the "deftness" with which the game was able to direct the player's eyes, and the strength of Alyx as a companion; concluding that "...in an interactive genre bound to the traditions of the pop-up gun and invisible hero, it simply doesn’t get more sophisticated than this". Episode One earned an overall score of 87% on review collection websites Metacritic and Game Rankings.

Despite a primarily positive reception, a common criticism of the game has been its short length. Depending on the player, the game can take less time to complete than the company line of 4–6 hours, which has caused various observers to raise the issue of whether it justifies the price tag. Other reviews have argued the futility of reviewing the game due to its episodic nature; as the first part of a three-part story arc it is difficult to judge it divorced from the final product. Reviewers also expressed disappointment at a lack of new features, including environments and weapons.

Awards IGN awarded Episode One with the title of Best PC FPS of 2006, describing it as a "great bang for the buck using Valve's new episodic plan" though not offering "the complete experience that Half-Life 2 was". Gamespy ranked Episode One as one of their 2006 games of year, placing it ninth and making further note of the implementation of Alyx as a believable and useful companion.

Soundtrack All the listed tracks were composed by Kelly Bailey (composer). The music is used sparingly throughout, primarily playing during scenes of major plot developments or particularly important action sequences such as large battles or encountering a new enemy.

"Disrupted Original" - 1:18

"Combine Advisory" - 1:54

"Guard Down" - 1:39

"Darkness at Noon" - 0:56

"Self Destruction" - 2:00

"Eine Kleiner Elevatormuzik" - 1:18

"What Kind of Hospital Is This?" - 3:04

"Infraradiant" - 4:37

"Decay Mode" - 3:06

"Penultimatum" - 2:49

References

External links Official Official Half-Life 2: Episode One website Official Steam website Official Half-Life 2 website Game Guides: HeadCrab Union Game Guide GameSpot Game Guide Press Eurogamer's Episode One Preview 1UP.com exclusive Half-Life 2: Episode One preview Critique Half-Life 2: Episode One Critique (Google Video, 45 m) Half-Life 2: Episode One Review (The Ant Nest)

{{Infobox CVG|bgcolour = #FF974D|title = Half-Life 2: Episode One|image = |developer = Valve Corporation|distributor = [Electronic Arts Worldwide
Unalis in Taiwan and Vivendi Universal Games (incl. [High dynamic range rendering)|released = June 1 2006|modes = [Single player: Mature 17+
[Office of Film and Literature Classification (Australia): MA 15+
PEGI: 16+, BBFC: 15
BPjM: 18] (Windows), Xbox 360, PlayStation 3 and [Steam (content delivery), Blu-Ray, [DirectX 9.0c or higher (included), Internet Connection (Broadband or better recommended)] and Mouse (computing)-->Half-Life 2: Episode One is the first of a trilogy of Episodic games for the 2004 in video gaming first-person shooter game, Half-Life 2. It was developed by the Valve Corporation and was released on June 1, 2006, receiving a positive critical reaction. The episode is a stand-alone game; while a continuation of Half-Life 2, it does not require the original game to be installed or registered to a user's Steam (content delivery) account to play. It takes advantage of several major upgrades to the Source engine since the release of Half-Life 2, primarily its high dynamic range rendering capabilities and the upgraded facial animation system.

The episode takes place immediately after the end of Half-Life 2, in and around the war-torn setting of City 17. Episode One continues to follow scientist Gordon Freeman and his companion Alyx Vance as they deal with the events of Half-Life 2 and humanity's continuing struggle against the Combine (Half-Life 2).

Valve views episodes One through Three as tantamount to a stand alone release, essentially Half-Life 3 divided into three episodes. Episode One was released together with Half-Life Deathmatch: Source, a port of the original Half-Life's multiplayer, which doubles as ''Episode One'''s multiplayer component. The retail copies of Episode One also come with Half-Life 2 Deathmatch for those who have not previously purchased the latter title. Episode One is also available as part of a bundle package known as The Orange Box, which also includes Half-Life 2, Half-Life 2: Episode Two, Team Fortress 2 and Portal (video game).

Plot talks on a communication screen with Isaac Kleiner and Eli Vance outside the Citadel.The series of following events in Half-Life 2, Episode One starts out after the explosion of the List of Combine non-combat technology in Half-Life 2#The Citadel's dark energy nuclear fusion reactor from which Gordon was extracted by the G-Man and Alyx Vance was left behind. As time stops, several Vortigaunts appear and rescue Alyx from the blast. The G-Man (Half-Life) is then seen walking toward Gordon Freeman. As he opens his mouth to speak, he is distracted by blue lights and is separated from Gordon by another group of Vortigaunts - much to his displeasure.G-Man: We'll see...about that (Half-Life 2: Episode One) Valve, 2006 More Vortigaunts then surround and teleport Gordon.

Gordon wakes up outside the Citadel, buried under a pile of rubble. Dog (Half-Life 2) removes these rocks, and Gordon is reunited with Alyx. Alyx contacts Eli Vance and Isaac Kleiner, who have managed to escape the city, and is informed that the Citadel's core is at risk of exploding at any moment.Kleiner: Our remote sensors indicate that the process is accelerating toward a dark-energy flare. Anyone left in the vicinity will be subjected to energetic events whose effects are beyond my powers of speculation! (Half-Life 2: Episode One) Valve, 2006 Kleiner states that the explosion could be large enough to level the whole of City 17, and that the only way for them to survive would be to re-enter the Citadel and slow the core's progression toward meltdown. Eli reluctantly agrees when he sees no other option. Alyx and Gordon re-enter the Citadel to try to stabilize the core.Kleiner: Well...nothing short of a direct intervention could possibly retard the reaction. (Half-Life 2: Episode One) Valve, 2006

They discover a large chamber with a recording of the discussion between a Combine (Half-Life 2)#Combine Advisors and Wallace Breen before Gordon chased him down in Half-Life 2.Breen: It's me you should be worrying about. I can still deliver Earth, but not without your help... The portal destination is untenable, surely you can set the relay elsewhere. There's no way I can survive in that environment... A host body?! You must be joking! I can't possibly- Oh alright, damn it! If that's what it takes. Just hurry, he's right behind me! (Half-Life 2: Episode One) Valve, 2006 The recording ends, interrupted by a brief image of a Combine Advisor. Alyx and Gordon are then subject to psychic blasts as a List of humanoid and synthetic Combine in Half-Life 2#Combine pod is transported through a tube in the control room.

Gordon and Alyx are successful in re-engaging the reactor's containment system, delaying the explosion. Alyx subsequently discovers that the Combine are deliberately accelerating the destruction of the Citadel to send a message off-world. She makes a copy of the message packet, ensuring that the Combine make them their prime target.Alyx: I can't tell what the packet contains, but it's important enough that they're willing to sacrifice the whole citadel to send it off. We need to get it back to my dad and Doctor Kleiner at the outpost right away. I've been pulling down a copy. Whatever it is, I have a feeling it's bad news for all of us. (Half-Life 2: Episode One) Valve, 2006 In addition, Alyx locates and downloads a transmission from Dr. Judith Mossman describing a certain project she has located, before being cut off by a Combine attack.Mossman: I'm fairly sure I've pinned down the location of the project. It's hard to say how much of it might have survived intact or if there is anything remaining that could compromise our work; if it were discovered by the Combine. We'll need to take a close look at it, of course, but I should be able to give a better opinion within a few hours. If the site is where we think it is, it should be no more than... I'm gonna have to cut this short, we may have been spotted.. (Half-Life 2: Episode One) Valve, 2006 Alyx and Gordon then board a List of Combine non-combat technology in Half-Life 2#Razor Trains to escape the Citadel.

The train derails underground and the duo fight to the surface. Dr. Kleiner appears on the screens that Breen once used to pass out propaganda, giving out useful updates to the evacuating citizens about the latest turn of events as well as reiterating the Citadel's imminent collapse.Kleiner: Therefore, I repeat, evacuate City 17 at once if not sooner! I cannot state this without enough undue emphasis. (Half-Life 2: Episode One) Valve, 2006 The city is in disarray, with Antlions and Headcrabs running rampant throughout the ruins created by the ongoing conflict between the Combine and the Resistance.

Alyx and Gordon eventually meet up with Barney Calhoun and a group of other survivors who are preparing to move on a train station in order to escape City 17.Barney: You guys know about the evacuation trains, right? Alyx: Yeah. Barney: Yeah, well, we've been planning to make a push on the train station. (Half-Life 2: Episode One) Valve, 2006 Gordon and Alyx split up from the group and move through a abandonment hospital to draw the Combine forces away from the refugees.Alyx: If Gordon and I took a separate route, we could draw the Combine away from you. (Half-Life 2: Episode One) Valve, 2006 Upon reuniting with Barney at the train station, Alyx and Gordon work to move the citizens to the trains while facing Combine opposition.Barney: If you can keep them safe and provide cover, we might actually stand a chance of reaching the escape trains Alyx: Sounds good. (Half-Life 2: Episode One) Valve, 2006 They decide to stay behind to lure the Combine away from Barney and the citizens as they make their escape.Barney: You guys coming? Alyx: Go on Barney! They're not after you. Gordon and I will draw their attention while you get the others away from here. (Half-Life 2: Episode One) Valve, 2006

The duo reprogram another train and board the caboose. As the train heads away, the Citadel is visible in the background with the reactor core about to explode, and the Combine's message is sent.Alyx: Oh my God! The message is going out. (Half-Life 2: Episode One) Valve, 2006 Several Advisor pods are ejected from the Citadel as it detonates. The shockwave from the exploding Citadel causes wreckage to fly toward the train, and the screen fades as the blast overtakes the train. The last thing that the player hears is the twisting of metal and Alyx whispering Gordon's name.

The fate of Alyx and Gordon is revealed in the sequel Half-Life 2: Episode Two.

Gameplay As a direct continuation of Half-Life 2, no significant changes to the gameplay were undertaken. As in Half-Life and Half-Life 2 players make their way through a linear series of level (computer and video games), encountering various different enemies and allies. The gameplay is broken up between combat orientated challenges and puzzles; these include physics-based puzzles. Episode One also integrates Tutorial#Computing like tasks into the story itself as in the previous games in order to familiarize the player to any new gameplay mechanics, such as the ability to re-program rollermines, without breaking immersion. Like Half-Life 2, the gravity gun continues to play a crucial function throughout the game, granting the player extensive use of physics in combat and puzzle-solving.

One significant gameplay addition was the enhancement of co-operative play with friendly NPCs, most notably with the character of Alyx Vance - her AI was specifically designed for co-op play in Episode One so that she would compliment as opposed to hinder the player's abilities and prove a useful ally in combat and puzzle solving situations, while being specially programmed to avoid performing too many mechanical or repetitious actions such as repeating lines of dialogue or performing certain routines in combat situations, thus separating her from the more generic NPC allies the player fought beside in the later levels of Half-Life 2.Half-Life 2: Episode One, Chapter I: Undue Alarm, Developers commentary Examples of this co-operative gameplay include combat in the darker underground levels mid-game where the player can use their flashlight to help Alyx spot and kill oncoming enemies and in doing so conserve their ammunition,Half-Life 2: Episode One, Chapter III: Lowlife, Developers commentary as well as in gameplay sections late in the game where Alyx provides covering fire while the player travels to a certain area or performs certain actions, therefore keeping the player safe while they undertake their tasks.Half-Life 2: Episode One, Chapter IV: Urban Flight, Developers commentary The developers described Alyx's programming for Episode One as a "personality code" as opposed to an "AI code", further emphasising their attention to creating a unique and believable companion.

Enemies such as List of humanoid and synthetic Combine in Half-Life 2#Stalker and areas of the Citadel glimpsed at the end of Half-Life 2 are encountered and explored by the player. Other new additions include the Headcrab#Zombine, List of humanoid and synthetic Combine in Half-Life 2#Combine pod and List of humanoid and synthetic Combine in Half-Life 2#Hunter; the latter two introduced as set-up for Half-Life 2: Episode Two are only briefly interacted with. While new creatures were added, there were no additions to the game's current weapon arsenal.

While no entirely new locales were introduced for Episode One, large alterations were made to the appearance of both City 17 and the Citadel from the end of Half-Life 2 to reflect the changing shape of the world and to serve as a story reminder to the player how their actions have affected the greater whole. The Citadel has degenerated from the cold, alien and imposing fortress of the previous game to an extremely unstable state, providing a visual cue to remind the player of the catastrophic damage they inflicted, to allow for new gameplay elements that accentuate the new dangers that come with the Citadel's imminent collapse and to serve a thematic purpose in highlighting the weakening of the Combine's dominance. Likewise, City 17 has been altered to reflect the aftermath of the resistance's open rebellion, with vast swathes of destroyed buildings and the introduction of foes previously kept outside its confines in Half-Life 2 in order to further emphasise the scale of the uprising. The introduction of the Zombine enemy, while providing a new dynamic in the game's enemy menagerie also serves a story purpose in showcasing the Combine's loss of control. Valve stated that they were interested in re-using concepts and providing twists on them - describing it as an important part of their philosophy to challenge the player's familiarity with previously encountered locations and enemies. An example of this is the use of the Citadel as constant presence in the episode's backgrounds - in Half-Life 2 it was clearly defined as the player's ultimate destination and where they must battle to, but now it is a source of impending disaster and the point from which the player must get the farthest from.

Development Valve explained that the focus of Episode One was character development, in particular that of Gordon Freeman female sidekick and friend Alyx Vance, to the extent that she accompanies the player for virtually the entire game. Project lead Robin Walker discussed the thinking behind this approach in the episode’s announcement article in the May 2005 issue of PC Gamer'’ "It's kind of ironic that despite so much of the theme of Half-Life 2 being about other characters and other people, you spent most of the game alone".

Lead writer Marc Laidlaw expanded further on the game's premise in the same article:

After some initial confusion, sparked partly with an attempt at humour by PC Gamer UK, which suggested that Alyx was Episode One's playable character, it was confirmed that players would indeed play as Gordon Freeman – unlike the original Half-Life expansion packs, which all dealt with different characters. Valve explained their desire to develop Episode One in-house as opposed to working with outside contractors as with previous expansions as a decision based on their comfort with the technology and construction tools of Half-Life 2, as well as their enjoyment of working on Half-Life 2 content.

Originally called Half-Life 2: Aftermath, the expansion was renamed to Episode One as an indication of Valve's confidence with their episodic structure, an implication confirmed in February and May of 2006 with news of a trilogy of episodes covering the present story arc. While the plots and dialogue of Half-Life and Half-Life 2 were written solely by Valve's in-house writer Marc Laidlaw, the "Half-Life 2 Episodes" are Collaborative writing by Laidlaw, Chet Faliszek and Erik Wolpaw with Laidlaw retaining overall leadership of the group.

As the character of Alyx accompanies the player for the vast majority of Episode One aiding in puzzle solving and combat situations, Valve made major modifications to her AI throughout development that allowed her to react to the players actions - such as commentating on objects the player manipulates or obstacles they have overcome. She also acts as an important device in both plot exposition and directing the player's journey, often vocalizing what the player is required to do next in order to progress. The developers explained a large part of their focus was creating not only a believable companion for the player, but also one that did not obstruct the player's actions; allowing them to dictate their own pace and method of overcoming any challenges faced without being hindered - this meant often scaling back Alyx's input and dialogue during the player's journey so that they would not feel pressured to progress and consequently object to her presence. The developers also placed what they described as 'hero moments' throughout the game that allow the player to single-handedly overcome certain obstacles, such as particularly challenging enemies, with Alyx taking the role of an observer and giving the player praise and adulation for their heroic feats.Half-Life 2: Episode One, Chapter V: Exit 17, Developers commentary Playtesters were used extensively by the developers throughout the entirey of the game's creation in order for Valve to continually gauge the effectiveness of ingame scenarios as well as the difficulty.

The game runs on an incrementally upgraded version of Valve's proprietary Source engine, and features both the engine's high dynamic range rendering capabilities, and a new version of its Source engine#Facial Animation 2 technology.Half-Life 2: Episode One, Chapter II: Direct Intervention, Developers commentary Upgrades to enemy AI allow Combine soldiers to utilize tactics previously unavailable to them, in particular the ability to crouch while being fired upon in order to "duck" underneath the player's line of fire. This feature is showcased to the utmost for the first time in the large street battle the player progresses through before entering the rebel safehouse in the game's fourth chapter. It also features the commentary node system debuted in the Half-Life 2: Lost Coast technology demo.

Episode One retailed at launch for $19.95 in the U.S. and is currently available over Valve's Steam (content delivery) for $9.95 USD. The game is also being distributed through traditional retail channels by Electronic Arts both as a standalone and as part of the Half-Life 2: Platinum Collection. The game became available for pre-load and pre-purchase through Steam on May 1 2006, with Half-Life: Source and Half-Life 2: Deathmatch immediately available for play as part of the package. Episode One is also included in the PC, Xbox 360 and Playstation 3 versions of The Orange Box.

Reception Critical response Critical and public response to Episode One was broadly positive, with some reviewers praising the game for having more intricate, well-paced gameplay than the acclaimed Half-Life 2. The game's interactivity, particularly in the shape of the character of Alyx and her reactions to the player's actions and the events of the game, has also received praise. PC Gamer magazine gave an 85% in the US edition, summarizing that "...while this inaugural episode may not be the essential FPS that Half-Life 2 is, I can't imagine any shooter fan who'd want to miss it". The game received 90% in the UK edition, which directed particular praise on the balance between puzzle orientated and action orientated challenges throughout the game. In Australia, the magazine PC Powerplay awarded the game with a rarely seen 10/10. Edge (magazine) gave the game 8 out of 10, praising the "deftness" with which the game was able to direct the player's eyes, and the strength of Alyx as a companion; concluding that "...in an interactive genre bound to the traditions of the pop-up gun and invisible hero, it simply doesn’t get more sophisticated than this". Episode One earned an overall score of 87% on review collection websites Metacritic and Game Rankings.

Despite a primarily positive reception, a common criticism of the game has been its short length. Depending on the player, the game can take less time to complete than the company line of 4–6 hours, which has caused various observers to raise the issue of whether it justifies the price tag. Other reviews have argued the futility of reviewing the game due to its episodic nature; as the first part of a three-part story arc it is difficult to judge it divorced from the final product. Reviewers also expressed disappointment at a lack of new features, including environments and weapons.

Awards IGN awarded Episode One with the title of Best PC FPS of 2006, describing it as a "great bang for the buck using Valve's new episodic plan" though not offering "the complete experience that Half-Life 2 was". Gamespy ranked Episode One as one of their 2006 games of year, placing it ninth and making further note of the implementation of Alyx as a believable and useful companion.

Soundtrack All the listed tracks were composed by Kelly Bailey (composer). The music is used sparingly throughout, primarily playing during scenes of major plot developments or particularly important action sequences such as large battles or encountering a new enemy.

"Disrupted Original" - 1:18

"Combine Advisory" - 1:54

"Guard Down" - 1:39

"Darkness at Noon" - 0:56

"Self Destruction" - 2:00

"Eine Kleiner Elevatormuzik" - 1:18

"What Kind of Hospital Is This?" - 3:04

"Infraradiant" - 4:37

"Decay Mode" - 3:06

"Penultimatum" - 2:49

References

External links Official Official Half-Life 2: Episode One website Official Steam website Official Half-Life 2 website Game Guides: HeadCrab Union Game Guide GameSpot Game Guide Press Eurogamer's Episode One Preview 1UP.com exclusive Half-Life 2: Episode One preview Critique Half-Life 2: Episode One Critique (Google Video, 45 m) Half-Life 2: Episode One Review (The Ant Nest)