The game contains two types of cards: levels (with numbers from 1 to 9) and balloons (with addition and subtraction operations; for example, a balloon card with a three has both "+3" and "- 3"). Each player starts with 6 cards after mixing the two decks, and one card of each type is placed in the center of the table. In turns, each player can throw all the level cards they want, as long as the number that appears on them is the same as the one on the level card on the table, or the result of applying any of the operations to said number of the balloon letter. You can also shoot balloon cards if it makes it possible to shoot another level card later. The player who first runs out of cards in hand wins a star. The one with the most stars will win the game.