Solitaire
From Tardis Wiki, the free Doctor Who reference
Solitaire was a card game which involved laying cards atop each other, altering colour. For example, red seven on black eight, black three on red four, etc.
The Second Doctor played solitaire while waiting on Gallifrey for Jamie and Zoe. (TV: The War Games) The Celestial Toymaker played solitaire just before Charlotte Pollard entered the Toy Shop. (AUDIO: Solitaire)
