Gears of War 2: Hollow is an unofficial PC port of the 2008 game Gears of War 2, developed by Helios, nearly two decades after its original Xbox 360 release. This custom community build includes the original campaign, multiplayer, horde, and cooperative modes, along with all downloadable content maps. The port is based on a flawed, previously unreleased PC development build and incorporates all content from the Xbox 360 version for single-player gameplay. The multiplayer aspect is still in testing and is advised to be treated as a beta version. The port is compatible with Windows and has been reported to work on Linux-based systems like the Steam Deck. Players can use either a controller or keyboard and mouse, although the user interface defaults to controller prompts. The port features a launcher for customizing settings such as resolution, frame rate limits, and graphical details. Players are encouraged to have a legally obtained copy of Gears of War 2 to respect intellectual property rights.