The first video game to feature boss fights.
The original 1975 version by Ray Wood and Gary Whisenhunt no longer exists, but the Cyber1 network hosts v5.4 and v8.0 versions of the game, both featuring enhancements made by Dirk and Flint Pellett. The v8.0 version is much bigger and much more complex, featuring three dungeons instead of one, and an online instruction manual with more than twice as many pages.