From publisher blurb:
The bombs fell. Nations wielded varied and monstrous weapons against one another. Fires, clouds of poison, and worse have swept the world. Now only the savage Wastes remain: haunted by mutants, deranged robots, and genegineered monstrosities. But from the fire, heroes and villains rise: tribals, survivors, mutants, all the warped remnants of Humanity. Armed with primitive weapons, pre-Collapse artifacts, and afflicted by strange mutations, they set forth to conquer the wastes, or at least to survive them. By spear and laser, they shall prevail – or die a horrible death.
Cepheus Atom is a lightweight role-playing game where players assume the roles of survivors exploring a sci-fantasy post-apocalyptic world. This is, as some people call it, a “gonzo” apocalypse – expect sentient mutant animals and plants!, death-ray guns, and wild mutations, rather than the grimmer darkness of a more realistic apocalypse. The rules are designed for fast, “beer and pretzels” play, where players roll dice and blow up stuff between bites of pizza and sips of soft drink, all while enjoying an evening with friends.
All you need to play are this booklet, a few six-sided dice, writing supplies, and your wild, mutated imagination!