Snakes and ladders

Snakes and ladders was a board game that originated on Earth. It involved navigating "up the ladders, down the snakes" — a movement which Susan Foreman found "comforting" and "meaningless". (PROSE: Time and Relative)

The Seventh Doctor had a snakes and ladders game from the 1930s or 1940s in Smithwood Manor. (PROSE: Cat's Cradle: Warhead)

In the Althosian system, snakes and ladders had replaced chess as the game of intellectuals, who reasoned that its reliance on chance reflected life better. (PROSE: The Pit)

When Mickey Smith said he was playing a game, the Ninth Doctor asked if it was a "nice bit of Snakes and Ladders, [or] something a bit more sophisticated like Snap". (PROSE: Winner Takes All)

The Tenth Doctor once jokingly mentioned snakes and ladders when asked what his "game" was. (TV: Fear Her) Susan Foreman enjoyed playing the game, and did so on 29 March 1963 after her Games class at Coal Hill School was called off due to frozen pipes disabling the showers. (PROSE: Time and Relative)

Snakes and ladders was one of the games the Celestial Toymaker played with his victims. In the Toymaker's version, his opponents found themselves on a life-sized version of the game, having to climb actual ladders and evade giant snakes. (PROSE: Divided Loyalties, COMIC: Endgame) The Twelfth Doctor and Clara Oswald were chased across the board by a Krampus. (COMIC: Relative Dimensions)

Martha Jones compared the Domovoi sending the occupants of Dreamhome to the house's lower levels to playing snakes and ladders. However, Solin Tiermann did not get the reference. (PROSE: Sick Building)

Behind the scenes

 * Doctor Who The Official Annual 2007 featured a playable variant of snakes and ladders made with references to Tooth and Claw called "Werewolf Attack!"
 * DWA 177 contained a playable snakes and ladders variant called "Don't Go Up the Stairs."