Nay-Jay is a super-fast card game with simultaneous group play. Each player begins the game with their own deck from which they deal themselves a down-pile and four draw cards. They hold onto the rest of the deck to flip over one at a time in order to find more cards to play.

Cards are played in the common area on piles that are started with a "1". These card piles can be built up or down on with cards of the same color. Wild cards can be played on a pile to change its top number, color, or both. The first player to use all of the cards from their down-pile shouts "NAY-JAY!" and the round ends. The game lasts 6 rounds, and at the end the player with the highest score wins.