Countdown to Doom is a text adventure computer game, more recently termed interactive fiction, written in 1982 by Peter Killworth. Its setting is the planet Doomawangara, which is coyly said to be shortened to "Doom". There are two sequels, Return to Doom and Last Days of Doom. In this game, the player's spaceship crash-lands on Doom's inhospitable surface and they emerge from the wreckage to realise that, unless they can locate the necessary spare parts, their ship will corrode away in a mere 400 time units. There are many ways to be killed in this game.