Snakes and ladders

Snakes and ladders was a board game originating 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 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)

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."