From Publisher Website: Roll ’n Add is the 2-in-1 fun way to introduce addition to younger children. Plus is a beginning addition game, and Double is an advanced addition game using beginning multiplication strategies. Both games are played with our unique 10-sided dice to enable players to add or double numbers up to 20. To play both games, simply roll the dice, add or double the numbers, and strategically place the corresponding numbered playing piece on the board. Like tic-tac-toe, players strive for three in a row. Because Roll ’n Add encourages cooperative play, opponents assist each other in adding the numbers, and the enclosed addition table confirms the answer. Sound easy? It is! But watch out! Your playing piece may be captured and flipped to the opponent’s side! Luck and strategies, not addition ability, win this game - so even the beginning player can compete!