The game uses a ring numbered from 1 to 40 with sliders on it. At the start, the sliders are set randomly (by card draw). On your turn, you draw a card, then play a "gapper" if possible (a gapper is a card falling between the numbers where the sliders rest, as indicated by the sliders’ arrowheads), and finally discard a card, moving a slider to the discards number. There are wild cards in the deck.

If a player goes out, he wins 5 points plus one point per card still held by the other players. 25 points wins the game.