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Fallout: A Post Nuclear Role Playing Game is an open-world turn-based role-playing video game developed and published by Interplay Productions in 1997. The game has a post-apocalyptic and retro-futuristic setting, taking place in the mid-22nd century decades after a global nuclear war in an alternate history timeline. The protagonist of Fallout is an unnamed inhabitant of a Vault, part of a network of long-term nuclear shelters, who is forced to venture out into the wastes to find a replacement Water Chip and save their fellow Vault inhabitants. Fallout is considered to be the spiritual successor to the 1988 role-playing video game Wasteland. It was initially intended to use Steve Jackson Games' system GURPS, but Interplay eventually used their own internally developed system, SPECIAL. The game was critically acclaimed and a financial success. It was followed by a number of sequels and spin-off games, collectively known as the Fallout series.