Cluedo, also sometimes rendered as Cluedo?, was a board game originating on Earth.
Jamie McCrimmon told Cosmae that the Second Doctor was very fond of Cluedo. (PROSE: The Menagerie)
The Seventh Doctor had a Cluedo game from the 1930s or 1940s in Smithwood Manor. (PROSE: Cat's Cradle: Warhead)
The "ultimate bedroom" that the Eleventh Doctor had set up for Lily and Cyril Arwell included a copy of Cluedo. (TV: The Doctor, the Widow and the Wardrobe)
Mel Joseph offered to play a game of Cluedo with Ace. He later threatened her with a full-scale replica of the revolver from Cluedo, but she recognised it as a fake. (PROSE: Conundrum)
Christine Summerfield reflected that, when confronting the Horror, she could have challenged it to a game of Cluedo to finish the conflict. (PROSE: Dead Romance)
Professor Proven had a Cluedo game in his house. (PROSE: The Sleuth Slayers)
The death of Professor Gerald Peach, as noted by Donna, greatly resembled a possible murder scenario in a game of Cluedo. (TV: The Unicorn and the Wasp)
When Rhys Williams spotted that poker chips and playing cards were included in a James Bond boxset, he joked "They'll be putting Cluedo in with Poirot next". (PROSE: The House That Jack Built)
In 2025, the Fifteenth Doctor and Anita Benn at least once played Cluedo as part of their regular "chair night." (TV: Joy to the World [+]Steven Moffat, Doctor Who Christmas Special 2024 (BBC One and Disney+, 2024).)
Behind the scenes
Cluedo is known as Clue in the US. Two Doctor Who-themed versions of the game were released in 2015: Clue: Doctor Who was made by USAopoly, while Hasbro released the Twelfth Doctor-based Cluedo: Doctor Who--The Hunt for Gallifrey.
Several actors from Doctor Who have starred in the main cast of the British TV game show adaptation of Cluedo produced by Granada Television for ITV between 1990 and 1993, with all of the 6 suspects having been played by at least one Doctor Who actor across the series.