Fort Apocalypse is a multidirectional scrolling shooter for Atari 8-bit computers created by Steve Hales and published by Synapse Software in 1982.

[1] While the programming was getting started, another programmer decided to leave the company in the midst of completing one of Wolosenko's projects, Slime.

Hales was pulled off the development of Fort Apocalypse to finish Slime, but found the code too difficult to continue and had to start over from scratch.

[1] The resulting delay meant Broderbund's Choplifter reached the market first, and Fort Apocalypse was often considered a me-too effort.

[1] Softline praised Fort Apocalypse's "game complexity and difficulty of play—just enough to keep you coming back and progressing a little further each time".

[4] Also noting the game's difficulty, The Commodore 64 Home Companion called the graphics and sound "impressive".

In April 2015, Steve Hales released the assembler source code to Fort Apocalypse on GitHub, also under CC BY-NC-ND 2.5, for historical reasons.