Diffusion

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Diffusion is a total-conversion mod in its own universe, based on Half-Life SDK and running on Xash3D FWGS engine. You, James Smith (served in SWAT for a decade with no failed ops), on vacation and driving your car to some nice place, to take a break from your usual work routines. Driving on a deserted road somewhere in Utah, the car breaks down. With miles of nothing behind, J. decides to go forward and stumbles upon an abandoned rock/sand processing factory with just one yawning guard sitting there. Pointed by the guard, J. walks behind the factory to find the phone. When he comes back, he only sees two army trucks and the dead guard… J.'s curiosity leads him inside the factory only to find that this place is absolutely not what it seems to be…

GameGator compares prices. This description, the release dates, and the age ratings come from IGDB. A later date on another platform is a separate release. A date still in the future is marked as not released yet.

Genres

Shooter

10,173 games

Platforms

Windows

74,583 games

Releases

Nov 22, 2025

Windows