List of Valve games

Games published

Canceled and unreleased games

Several games announced by Valve as being in development have since been put on hold indefinitely or cancelled.

Half-Life

• Half-Life: Hostile Takeover: an expansion pack for the original Half-Life developed by 2015, Inc.,^[138] reportedly cancelled in 2000.^[139]
• Half-Life 2: Episode Three: announced in 2006 with a release date of late 2007, and was put on hold, possibly cancelled due to scope creep, unsatisfactory internal experiments, and the desire to develop the Source 2 engine first.^[140]
• Untitled Half-Life 2 episode: developed by Junction Point Studios and led by Warren Spector. Development ceased when Junction Point signed a deal with Disney Interactive Studios to develop Epic Mickey.^[141] Valve took Junction Point's project and passed to Arkane Studios.^[142]
• Ravenholm (also known as Return to Ravenholm or Half-Life 2: Episode Four): developed by Arkane Studios around 2006–2007, with Opposing Force protagonist Adrian Shephard as the player character and Father Grigori from Half-Life 2 in a supporting role.^[142]
• Half-Life 3: a version of Half-Life 3 was in development on the Source 2 engine from 2013 to 2014. Valve planned to incorporate procedurally generated levels alongside a "crafted experience" so that no two playthroughs of the game would be identical. It was cancelled as Source 2 was not yet stable enough to support full-scale development.^[143]
• Borealis: a virtual reality game led by writer Marc Laidlaw in development in 2015, set aboard the time-travelling ship Borealis. It was cancelled as it failed to gain momentum.^[143]

Others

• Untitled submarine game: one of Valve's earliest game ideas was for a submarine game, with Valve co-founder Mike Harrington seeing an opportunity to create "fantastic underwater visuals and gameplay". It is unknown whether it ever advanced beyond the conceptual stage.^[144]
• Prospero: a third-person exploration game with a science fantasy theme. The project was in development at the same time as Half-Life.^[145] Prospero's development team transitioned to work on Half-Life, which had gained more traction.^[146]
• Untitled role-playing game (I): a fantasy, action role-playing game about fairies that was in a prototype phase and cancelled prior to Left 4 Dead's release.^[147]
• The Crossing: a first-person shooter developed in collaboration with Arkane Studios. The project was announced in 2007 and put on hold in May 2009.^[148]
• Stars of Blood: a space pirate game. In November 2012, Newell revealed the project's name and confirmed that it was no longer in development.^[149]
• Left 4 Dead 3: an open-world sequel to Left 4 Dead 2 that was set in Morocco. It was cancelled when it became clear that the Source 2 engine was not yet ready to support full-scale game development.^[143]
  • Hot Dog: another attempt at creating a Left 4 Dead game, codenamed so that fans would not recognize it if its name were leaked.^[143]
• Untitled role-playing game (II): a fantasy RPG that was inspired by The Elder Scrolls, Dark Souls, and Monster Hunter series. It was at one point resurrected as a single-player RPG about the Dota 2 character Axe before it was shelved again.^[143]
• A.R.T.I.: a lighthearted voxel-based game that allowed for open-ended creation and destruction in a vein similar to Minecraft. It was resurrected as a VR game but shelved again when Half-Life: Alyx eclipsed its development.^[143]
• SimTrek: a virtual reality game developed primarily by the creators of Kerbal Space Program. It was cancelled during the development of Half-Life: Alyx.^[143]
• In the Valley of Gods: a period adventure game set in 1920s Egypt developed by Campo Santo, a studio acquired by Valve in 2018. It was put on hold in late 2019, with the designers shifting to other Valve projects.^[150]