Zork

Zork is a 1980s text-adventure computer game.

Episodes

 * In "The Hofstadter Isotope" (S2E20), Sheldon tells Leonard they will play the buggy beta version of Zork for Vintage Game Night but Leonard goes to a bar with Howard instead.
 * In "The Irish Pub Formulation" (S4E6), Sheldon plays Zork with an emulator.