Gateway to Apshai
generates its dungeons procedurally from a table of preselected pseudo-random number generator seed values. By replacing these values using hacking tools, new dungeons can be added to the game. However, not all seeds will successfully produce a dungeon. Both the Commodore 64 and Atari releases of this game lock-up at dungeon 8, level 7 due to a level generation failure (endless loop) . The ColecoVision version uses a different dungeon generation algorithm and/or random seeds and does not exhibit this particular bug.