Three levels of challenge. Cards have a self-check feature (answer on back) and offer three levels of difficulty. Easy, 1 Dot cards start with two numbers on each wheel; more challenging 2 and 3 Dot cards have three numbers per wheel. The target numbers for 1 Dot and 2 Dot cards are 3 through 10. The target number for 3 Dot cards is always 24.

How to play. Card has two wheels and a white target number. Pick the wheel that makes the target number using addition and subtraction ONLY. Use all numbers on the wheel, but use each only once.