A self-published setting by Michael Gibbons designed for use with "old school games" but obviously targeting the B/X D&D rules specifically.
- From publisher's description for the sole product:
"The sun’s gone weird and sullen. Broken monuments to forgotten glory lay strewn across and buried beneath the ever-changing face of the endless desert. Savage and desperate, merciless predators stalk sand and shade. Ancient now, the newest cities crumble; time laughs; indifferent, extinction continues.
BX mars is a science fantasy setting [...] for old school games."