Atom 20 is a multiple choice adventure game.
The time is the year 2000. An atomic war has taken place, wiping out a major portion of the population. You have been living within your bomb shelter for the last two months. Your food ration supply has nearly been exhausted. You must now go out into the new world and find any fellow human beings who have survived the war. The fate of mankind lies within your hands.
Played as a multiple choice text adventure, the player must successfully navigate a number of multiple choice challenges to try to survive the post-apocalyptic wasteland. The player starts with 3 days of food, 7 days of water, and a rifle with 50 rounds. The player may fall victim to radiation poisoning, stroke, accidents, poisonous foods, or even crazed people.