In Yay! you have to roll three dice on a 8x8 grid. You can write the sum of the dice in either field the dice touch, provided your opponent has not added a higher number on a neighbouring field. If an opponent has entered a lower number on a neighbouring field you can cross that field out. You may reroll your dice if you are not satisfied with your result, but the sum of the following dice roll has to be higher than your previous one. If it isn't, you have to cross one of your fields out. The game ends, when one horizontal and one vertical row is filled out. The player with the most occupied fields wins.