Kal-toh was a Vulcangame of intense strategy that could be played solitarily or by multiple individuals. The object of kal-toh, as stated by Tuvok, "Is not about striving for balance but about finding the seeds of order even in the midst of profound chaos." A kal-toh set consisted of a number of playing rods called t'an.
When described by Harry Kim to an amnesic Tuvok, he said "The object of the game was to turn this jumble of rods into a perfect sphere", and that each player takes turns to position pieces, the one managing to form the final intended shape winning. (VOY: "Riddles")