Similar to my former conversions, the original Commodore program is just running 1:1 on the Atari 800XL computer, which has the same CPU as the C64. The Commodore's graphics and sound effects were replaced by more or less equivalent Atari 800 XL routines. This port was really very easy. Contrary to the C64, the nerve-racking in-game music can be switched on and off in my Atari version by the "Option" key.
The program can be downloaded as an executable file here: rrr.xex
It is also available as an atr file here: rrr.atr
Here are two screenshots of the game on the Atari: