Post-Apocalyptic: Describes any game where the setting is soon after a world-wide nuclear war, where radiation has created mutants, entire cities are leveled, and necessities like gas, food, and water are hard to come by. Think shortly after a nuclear holocaust. Think "Mad Max Beyond Thunderdome". Examples: Wasteland, Fallout, etc. Part of the Non-Sports Themes category.
You can browse through games in the MobyGames database that are part of this genre via the game browser.