Phobos

Dive deep into the depths of a martian moon in this follow-up to the 8-bit Atari classic, Caverns of Mars.

Phobos is a follow-up to Caverns of Mars, both programmed by Greg Christensen and originally released via the Atari Program Exchange.

The developer also programmed a game called Caverns of Mars II, but that game was eventually released as Mars Mission II. Phobos is a more direct sequel of sorts to the original, vertically scrolling Caverns of Mars gameplay.