Students stack number tiles on their favorite "monstermatic" as they solve a variety of problems to win! Game uses numbers 0 to 20 and the four operations to help students develop calculation skills. Play at 2 different ability levels. Includes 4 monstermatics, 73 number and operations tiles, and game guide. Fill up your monstermatic with as many sums as you can stack the sum tiles high to win the game. Contains 4 monstermatic monsters, 73 number and operation tiles and game guide. A fun way to play with sums and practice calculating.