Half-Life 2

• 1. Introduction

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  Half-Life 2 is a 2004 first-person shooter from Valve Corporation, and it cost 40 million US dollars to make. Development lasted five years. By 2011 it had sold 12 million copies worldwide. In November 2024, twenty years after its release, 64,085 people were playing it on Steam at the same moment. That broke the earlier record of 16,101, set in August 2021. The player takes the role of Gordon Freeman, who joins a human resistance against an alien empire called the Combine. Behind that simple premise sits a long and difficult production. What did Valve set out to build, and what went wrong along the way?

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• 2. Showreels and Cabals

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  Work on Half-Life 2 began in June 1999, only six months after the first Half-Life was released. The team numbered 82 people, or around 100 once voice actors were counted. Valve's president, Gabe Newell, wanted a game that would reshape the shooter genre, and he put it bluntly: "Why spend four years of your life building something that isn't innovative and is basically pointless? If Half-Life 2 isn't viewed as the best PC game of all time, it's going to completely bum out most of the guys on this team." He gave the team no deadline and a budget described as "virtually unlimited," and he promised to fund the project himself if necessary. They built on Source, Valve's new in-house engine, which was developed at the same time as the game.

  In late 2001, Valve began a showreel, hoping to show it at E3 the following year. For several months Newell stayed away from the work, so that his later feedback would be unbiased. He spent that time on Steam, Valve's upcoming digital distribution service. The reel showed physics, environments, and a dialogue-heavy scene with the scientist Dr. Kleiner. Newell felt it did not show how physics would change gameplay, and he thought the Kleiner scene ran too long. The writer Marc Laidlaw drew a lesson from that response. Character drama, he concluded, had to support interactivity and gameplay.

  A second showreel, finished in September 2002, featured a buggy race along the City 17 coast. It also showed an encounter with headcrabs on a pier and an alien strider attacking the city. The Kleiner sequence had been cut down sharply. As with the original Half-Life, the team split into groups called cabals, each working on different levels. Designers built levels from placeholder shapes and surfaces, and artists then worked over them. In October 2002, Newell told the team that Half-Life 2 would be announced at E3 2003 and released by the end of that year.

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• 3. Physics as Play

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  Zombie Basketball was an early experiment, a minigame in which players used a physics-manipulating gun to throw zombies through hoops. Valve had integrated the Havok physics engine, which simulates real-world physics, to strengthen the player's sense of presence and open up new kinds of gameplay. In mid-2000, the team staged a battle between rioting citizens and police to test the physics and the non-player characters.

  The finished game gives the player a gravity gun that repels objects or pulls them in from a distance. Objects can be fired at enemies, held up as shields, or placed to reach new areas. Enemy grenades can be caught and thrown straight back. Puzzles also demand that the player use physics to find a way forward.

  Four weapons anchor the combat: a pistol, a submachine gun, a shotgun, and the powerful Combine pulse rifle. With a pheromone item, enemy antlions become allies who can be called over or sent to attack. Two driving sections add an airboat and a dune buggy. Around all of this, the game keeps the shape of the first Half-Life, with exploration, jumping challenges, puzzles and a story told through scripted sequences. In 2008, Guinness World Records listed Half-Life 2 as the first game to feature a gravity gun.

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• 4. Inside City 17

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  The first Half-Life never left the Black Mesa research facility, but Valve wanted "a much more epic and global feel" for the sequel. One early idea had the player teleporting between planets, but it was dropped because it would make continuity between levels difficult. The art director, Viktor Antonov, who was Bulgarian, suggested an Eastern European city, and the team agreed. In an early concept, players would begin by boarding the Borealis, an icebreaker bound for that city. Nova Prospekt began as a small rail depot built on an old prison in the wasteland. It grew from a stopping point into a destination.

  Valve had seen how players connected with minor characters in the first game, so it invested in the cast. The animator Ken Birdwell studied the psychologist Paul Ekman, who had researched how facial muscles express emotion. Laidlaw gave the characters family relationships, which he called a "basic dramatic unit everyone understands" but one that games rarely used. The voice cast included Louis Gossett Jr., Robert Guillaume and Robert Culp.

  Roughly twenty years after being placed in stasis, Gordon is inserted into a train bound for City 17 by the G-Man, played by Michael Shapiro. The Combine now rules Earth after the alien invasion at Black Mesa. Its puppet ruler is Dr. Wallace Breen, voiced by Culp, the former Black Mesa administrator, who governs from a skyscraper called the Citadel. Combine officers subdue Gordon, and Alyx Vance, played by Merle Dandridge, rescues him and guides him to Kleiner's laboratory. Kleiner's attempt to teleport Gordon to the Resistance base fails, and Gordon lands briefly in the Citadel. He then crosses the city's canals by airboat.

  At the base, Gordon meets Alyx's father, Dr. Eli Vance, played by Guillaume, and Dr. Judith Mossman, played by Michelle Forbes. Alyx introduces her pet robot, Dog, and hands over the gravity gun. Combine forces storm the base and capture Eli and Mossman. Gordon passes through Ravenholm, a zombie-infested town whose only inhabitant is Father Grigori. A dune buggy then carries him along a coastline of depleted water levels to Nova Prospekt, a Combine prison. There he and Alyx learn that Mossman is a Combine spy. She teleports herself and Eli to the Citadel, and the teleporter explodes moments after Gordon and Alyx use it to escape.

  Back at Kleiner's lab, Gordon learns that a week has passed. The Resistance has used the attack on Nova Prospekt to launch an armed rebellion. A security system in the Citadel vaporizes his weapons but accidentally supercharges the gravity gun, which helps him climb the tower. Captured, he is carried to Breen's office, where Eli and Alyx are already prisoners. Breen plans to use them as bargaining chips with the Combine, which contradicts what he told Mossman. Angry, she frees the captives. Gordon destroys the reactor, and Breen falls into the abyss. The G-Man freezes time, praises Gordon, and returns him to stasis.

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• 5. Broken Date, Stolen Code

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  At E3 2003, Valve announced Half-Life 2 with demonstrations of its characters, animation and physics. The reaction was positive, and the game won the E3 Game of the Show award. Newell also announced a release date of the 30th of September 2003, hoping it would motivate the team. They worked long hours, but by July it was clear they would miss the date. Rumors of a delay spread. On the 23rd of September, Valve released a statement targeting the holiday season, and fans responded with backlash.

  Newell had hesitated to announce a delay without a new date to offer. He said later: "We were paralyzed. We knew we weren't going to make the date we promised, and that was going to be a huge fiasco and really embarrassing. But we didn't have a new date to give people either." The graphics card manufacturer ATI had arranged a promotional event on Alcatraz Island to coincide with the planned release. Unable to pull out, Newell gave a prepared speech, demonstrated the Source engine, and left without answering questions.

  Four days before that statement, on the 19th of September, a German hacker named Axel Gembe had obtained the Half-Life 2 source code. He had infiltrated Valve's internal network months earlier. According to Gembe, he shared the code with another person, who leaked it online in early October. Fans soon compiled a playable version, which showed how unfinished the game was. The leaks damaged morale at Valve and slowed development. Fans also gave Valve details about the people involved.

  In March 2004, Gembe contacted Newell, saying he was a fan and had not acted maliciously. Newell worked with the FBI to invite Gembe to a fake job interview, planning an arrest in the United States. Police arrested him in Germany instead. In November 2006, Gembe was sentenced to two years' probation. Valve adopted new policies against leaks, such as requiring journalists to visit its office to play the game before release.

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• 6. Finish and Release

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  In early 2004, the team returned from Christmas to long hours and stressful conditions. The project was costing 1 million US dollars a month, with no guarantee of an end in sight. Still, Newell felt momentum building, since the team was producing about three hours of gameplay per month. In March, they made the first version playable from start to finish and paused development for a week to play through it. By then the Borealis had been cut, a jet ski had been replaced with the airboat, and the gravity gun appeared earlier in the game. Newell recalled: "The fact that you could go from one end of the game to the other was a really big thing for us." After several months of bug fixes and playtesting, Half-Life 2 was completed on the 13th of October 2004.

  Valve had already made a 1 GB portion available through Steam in encrypted form on the 26th of August 2004. On release day, the 16th of November 2004, Steam customers could pay, unlock the files, and play immediately, without waiting for a download. In retail, Vivendi Universal Games handled distribution through its Sierra Entertainment subsidiary. Customers could choose bronze, silver or gold editions, and the Gold Edition added merchandise such as a baseball cap, a strategy guide and a soundtrack CD by Kelly Bailey. None of the 2004 releases came with an instruction manual, only a reference card for installation and setup. Both the disc and Steam versions required Steam to be installed and active.

  On the 20th of September 2004, GameSpot reported that Vivendi was in a legal battle with Valve over distributing the game to cyber cafés. These venues were important to the gaming market in Asia, where PC and broadband penetration per capita were much lower. Vivendi said its contract covered cyber cafés, which would mean only Vivendi, not Valve through Steam, could supply them. On the 29th of November 2004, Judge Thomas S. Zilly of the U.S. Federal District Court in Seattle ruled that Vivendi was not authorized to distribute Valve games to cyber cafés for pay-to-play use. On the 29th of April 2005, the two companies announced a settlement. Vivendi would stop distributing retail packaged versions of Valve games by the 31st of August 2005, and the cyber café licenses moved to Valve. Electronic Arts became Valve's retail partner, and it would also handle the Xbox version.

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• 7. Praise and Complaints

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  Half-Life 2 holds an aggregate score of 96 out of 100 on Metacritic, based on 81 reviews. 1UP, GameSpy, The Cincinnati Enquirer, The New York Times and VideoGamer.com gave it perfect scores. Edge, which rated it ten out of ten, had given that mark to only four games before. Maximum PC awarded it 11 on a scale that normally peaks at 10, calling it "the best game ever made." Critics praised the graphics, physics, story and gameplay.

  In the United States, the PC version sold 680,000 copies and had earned 34.3 million dollars by August 2006. That made it the country's 17th best-selling PC game between January 2000 and August 2006. In the United Kingdom, it received a Platinum award from ELSPA, which indicates sales of at least 300,000 copies.

  Not every comment was warm. Several critics complained that Steam required an account, and that products had to be registered and permanently locked to that account before play. They also reported installation difficulties and a lack of support.

  The game earned 39 Game of the Year awards, including Overall Game of the Year at IGN. At the Game Developers Choice Awards it took Best Game, along with awards for technology, characters and writing. It picked up six awards at the 2004 British Academy Video Games Awards, more than any other game that night. Computer Gaming World nominated it for its top honors, though it lost to Painkiller and World of Warcraft. The editors still called it "a fantastic roller coaster of a ride." Computer Games Magazine ranked it the fourth-best computer game of 2004 and gave it Best Technology, ahead of Doom 3, and Best Writing. Its editors called it "a masterful single-player experience that plays a constant game of one-upmanship with itself."

  In 2009, Game Informer named Half-Life 2 the fifth-best game, praising how Valve changed the way shooters were created. Readers of The Guardian picked it as the best game of the decade. The journalist Keith Stuart wrote that it "pushed the envelope for the genre, and set a new high watermark for FPS narrative." In December 2021, IGN named it the ninth-best game of all time.

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• 8. Mods and Anniversaries

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  Electronic Arts released Half-Life 2 on the Xbox in November 2005. In 2006, Valve partnered with Taito to release Half-Life 2: Survivor, an arcade game for the Japanese market. The 2007 compilation The Orange Box brought the game to Windows, Xbox 360 and PlayStation 3. IGN found the physics impressive on console, though the Xbox 360 graphics looked weaker than on PC. GameSpot noted framerate problems on the PlayStation 3. On the 26th of May 2010, the game arrived on Mac OS X, and in 2013 Valve ported it to Linux with a free update adding Oculus Rift support. An Android port exclusive to the Nvidia Shield Tablet followed on the 12th of May 2014.

  Valve released a deathmatch mode in 2004. In 2005, it gave every buyer a free extra level, Lost Coast, which demonstrated new lighting techniques and high-dynamic-range rendering. Episode One followed in 2006 and Episode Two in 2007. After canceling Episode Three and several further Half-Life projects, Valve released a prequel, Half-Life: Alyx, in 2020. On the 22nd of December 2005, a 64-bit version of the Source engine arrived. Newell called it "an important step in the evolution of our game content and tools," though the site Techgage found stability problems and no notable frame rate improvement. In January 2022, Valve added an interface designed for the Steam Deck. For the 20th anniversary in November 2024, the game was made temporarily free on Steam. It was updated to include Episode One, Episode Two and Lost Coast, with better graphics and controls, restored content, bug fixes, developer commentary and a community workshop. Valve also released a two-hour making-of documentary.

  Since the release of the Source engine SDK, the community has built a large number of mods. Minerva is a set of fan-made levels. Rock 24, Half-Life 2 Substance and SMOD change the storyline and gameplay of the original. SourceForts and Garry's Mod let players experiment with the physics in a sandbox. Total conversions include Black Mesa, Dystopia, Zombie Master and Iron Grip: The Oppression, which turns the shooter into a real-time strategy game. In September 2008, Valve announced that several mods were being integrated into the Steamworks program. In September 2022, after a decade of development, fans released Half-Life 2: VR Mod. A year later, in 2023, Nvidia announced Half-Life 2 RTX, a collaboration with fan developers to add ray tracing using Nvidia's Remix tools.

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