When Was Clue (Cluedo) Invented? The 1943 Origin Story

The Facts

Inventor: Anthony E. Pratt, a British musician and factory worker from Birmingham.
Year: 1943 (during WWII air-raid blackouts).
Original name: Cluedo (portmanteau of "Clue" + "Ludo" = Latin "I play").
Patent: UK Patent 586,817 (granted 1947); US Patent 2,508,179 (1950).
First publication: 1949 by Waddingtons (UK) as Cluedo; 1949 by Parker Brothers (US) as Clue.

Development Context

Pratt designed the game during long evenings in air-raid shelters. His wife Elva helped design the board layout. The original concept—Murder!—had 10 characters, 11 rooms, and different weapons (axe, bomb, syringe, poison, fireplace poker). Parker Brothers streamlined to 6 suspects, 6 weapons, 9 rooms for production.

Key Design Innovations

Deduction mechanic: First mass-market game centered on logical elimination (not just roll-and-move).
Solution envelope: Hidden cards create information asymmetry—the core tension.
Suggestion/accusation system: Structured questioning forces strategic revelation.

Global Naming

Region	Name	Notes
UK, Commonwealth, Europe	Cluedo	Original name; "Reverend Green" vs. US "Mr. Green"
North America	Clue	Shortened; "Mr. Boddy" victim vs. UK "Dr. Black"
Brazil	Detetive	Licensed by Estrela; localized names
Spain	Cluedo	Suspects: Sr. Blanco, Sra. Azul, Prof. Violeta...

Legacy

Over 150 million copies sold worldwide (Hasbro estimate).
Inspired 1985 film Clue (3 endings), VCR/DVD games, video games, musical, books.
Inducted into National Toy Hall of Fame (2017).
Modern editions: Clue: Master Detective (more rooms/weapons), Clue: Harry Potter, Clue: Rick and Morty, Clue Conspiracy (2023 social deduction reimagining).

So: 1943, Anthony Pratt, Birmingham, UK. Born in a blackout, became a global classic.

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