[A] fanciful simulation of survival after a worldwide nuclear war. In your adventures, you may face the dangers of radiation poisoning, dangerous animals, poisoned food, and more!
Atom20 was written by Ray Brander and published as type-in source code in Creative Computing Vol. 5, No. 2, February 1979. Written in BASIC, it was intended for the Minnesota Educational Computing Consortium's system - but could be adapted to other flavors of BASIC.