The source code for Dandy (aka Dandy Dungeon) by Jack Palevich, for Atari 8-bit computers, shared with his permission.
5 ATR files that will work with your Atari computer or emulator:
Dandy 1.0 Doc 3-22-83.atr - documentation for version 1.0
Dandy 1.0 Source Backup 3-22-83.atr - source code for version 1.0
Dandy 1.2 Backup 4-23-83.atr - playable game, version 1.2
Dandy 1.2 Source Backup 4-23-83.atr - source code for version 1.2 (sectors 378 and 390 could not be recovered from the floppy)
Mantis Backup.atr - Jack said "Related to the Mantis cassette debugger that I wrote. I'm not sure if it has any Dandy information on it, but it might. I think I used Mantis to debug the cassette tape version of Dandy."