"Cluedo", known as "Clue" in North America, is a murder mystery game for three to six players (depending on editions). The game was first manufactured by Waddingtons in the United Kingdom in 1949. Since then, it has been relaunched and updated several times, and it is currently owned and published by the American game and toy company Hasbro.

Holed up in his home in Birmingham, England during air raids on the city during World War II, Anthony E. Pratt, an English musician and factory worker, recalled the murder mystery games played by some of his clients at private music gigs as well as the detective fiction popular at the time, most notably Agatha Christie.

In 1944, Pratt applied for a patent of his invention of a murder/mystery-themed game, originally named" Murder!" Shortly thereafter, Pratt and his wife, Elva Pratt (1913–1990), who had helped design the game, presented it to Waddingtons' executive Norman Watson, who immediately purchased it and provided its trademark name of "Cluedo" (a play on "clue" and "Ludo", "ludo" being Latin for "I play").

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