It predates the final version 2.0 of the full game. This demo requires a System 3.2 (ProDOS 16) boot disk contrary to the final game that requires System 4 (with GS/OS 2.0). It also requires a ROM 01 and will fail with a ROM 03.
Main differences with the full game:
The demo dungeon is tiny but it allows you to experience the gameplay for a few minutes.
Many graphics and sounds of the full game were replaced by empty placeholders in the graphics.dat. For example, the only remaining creature graphics are the Mummy, Screamer and Skeleton. However, there is only one skeleton in the demo dungeon and no other creature.
There is no copy protection and no ability to save and resume the game.
The demo dungeon is identical to the Amiga demo dungeon with only one difference in a text on a wall: The Amiga demo for US has these four lines of text: PRODUCED BY / FTL GAMES / SAN DIEGO / CALIFORNIA The Apple IIGS demo for Europe has these four lines of text: PRODUCED BY / FTL GAMES / DIST. BY / MIRRORSOFT