The basic goal of Kitty is to score points by winning bids and collected sets of cards. The core version of the game is for four players, but variants are covered later in the rules. The rules were first published with the Pairs The Princess and Mr. Whiffle deck, but they are also published in the Pairs Companion as well. The game utilizes the Pairs game system and is designed with the Princess and Mr. Whiffle deck, though it can be played with any Pairs deck.