DUNGEON 1979 was a Rogue-like game that predates actual Rogue. The game has a graphical glitch due to differences between BASIC 2.0 and BASIC 4.0. A fixed version has been released for the PET. I believe there is also a fixed version for the Apple, too. The details are
A Pre-Rogue-Like: Fixing 1979's DUNGEON for the Commodore PET (YouTube). The links are all in the description.
