Choose your operation:
Add [+] Subtract [-] Multiply [x] Divide [÷] Add/Subtract [+,-] Multiply/Divide [x,÷] Random [+,-,x,÷]

Select highest number: 1 2 3 4 5 6 7 8 9 10 11 12

Select lowest number: 0 1 2 3 4 5 6 7 8 9 10 11

When you are ready, click Start to begin. Use Stop to reset the game at any time.