This is a list of standalone video games that have been ported from a modification of another video game, and/or that are entirely based on a modification of another video game.
A game is considered standalone when it does not require the purchase or installation of any other game (including separate engine software such as the Source SDK) in order to run.
The classes and gameplay aspects remained the same.
The original developers were also involved in the production of The Red Solstice.
A sequel, Red Solstice 2: Survivors, was released in 17 June 2021.