Linux / GNU games

Papers, Please — simulation video game, adventure video game (2013)

Minesweeper — tilesweeper, puzzle video game (1989)

Garry's Mod — sandbox game, physics game, first-person shooter (2004)

2048 — puzzle video game (2014)

Medieval II: Total War — real-time tactics, turn-based strategy video game (2006)

Hollow Knight — 2D platform game, soulsvania, video game with LGBT character, Metroidvania (2017)

Crusader Kings II — grand strategy wargame, historical video game, wargame, real-time strategy (2012)

The Witcher 2: Assassins of Kings — fantasy video game, action role-playing game (2011)

Metro 2033 — post-apocalyptic video game, stealth game, survival horror, first-person shooter (2010)

BioShock Infinite — first-person shooter (2013)

Wolfenstein 3D — first-person shooter (1992)

Factorio — science fiction video game, sandbox game, survival game, construction and management simulation, real-time strategy, action game (2016)

Q111165107 — first-person shooter (2023)

Celeste — platform game (2018)

Half-Life: Blue Shift — science fiction video game, first-person shooter (2001)

Stellaris — space opera video game, grand strategy wargame, science fiction video game, 4X, real-time strategy (2016)

Half-Life: Opposing Force — science fiction video game, first-person shooter (1999)

Half-Life 2: Episode Two — science fiction video game, post-apocalyptic video game, first-person shooter (2007)

osu! — rhythm game, music video game (2007)

Kerbal Space Program — nonlinear gameplay, space flight simulation game, simulation video game (2015)

Metro: Last Light — post-apocalyptic video game, survival horror, first-person shooter (2013)

Batman: Arkham Knight — halloween video game, stealth game, action-adventure game (2015)

Sokoban — sokoban video game, puzzle video game (1982)

American Truck Simulator — truck simulation video game (2016)

Sonic the Hedgehog 2 — adventure, platform game (1992)

Metro Exodus — post-apocalyptic video game, stealth game, survival horror, first-person shooter (2019)

Crusader Kings III — grand strategy wargame, role-playing video game, real-time strategy (2020)

Baldur's Gate II: Shadows of Amn — role-playing video game (2000)

Fahrenheit — video game with LGBT character, interactive film, psychological horror, action-adventure game (2005)

Akinator — trivia video game (2007)