This game is really several games which can be played by children just learning numbers or older children that can add and subtract. Individual games can be made easier or more advanced. Deck includes 5 cards each of 0-16, plus 5 OY! cards.

In the first and easiest game, Tots OY! all cards are dealt and players keep cards face down in a stack. One at a time players play a card; if the card played is higher than the one before, or if an OY! card is played, players shout “OY!” to win the pile of cards.

In High 5 OY! each player gets two cards, then place one face up on the table to be the target number. Players look at their cards and decide if they want more (up to five) cards, then use all cards in an equation (adding or subtracting) to get as close as possible to the target number.

In Quick OY!, all cards are dealt, then the first player takes a card of his stack and lays it face up on the table. The next player takes his top card and lays it on top, with the corner number of the first card showing. Adding or subtracting the first two cards yields two target numbers; if the next player’s card is either of the target numbers, the first player to shout OY! wins the cards.

Players are dealt seven cards in Slap Match OY!, and the remaining cards go in a stock pile. Dealer turns up one card for the target number, and using the cards in your hands and addition or subtraction, players try to match the target number.

To play Fake OY! everyone gets seven cards, with the rest forming the stock pile, and a target number is turned up. After drawing one card from the stock pile you have to put two or three cards facedown that equal the target number by addition and/or subtraction. If you don’t have cards that equal the target number, you draw two or three cards from the pile, or bluff, laying down two or three cards anyway. If someone calls your bluff, you have to draw six cards. If you challenge a bluff incorrectly you must pick up two cards.

In Zero Set OY! players have nine cards, plus one drawn at the beginning of every turn, and the object is to lay down sets of three cards that equal 0 by addition and/or subtraction, and put them in your win pile.

Some of the games are slow, while some can be very fast and more competitive. See also A-B-C OY! in the Spelling section. - Stephanie