1. Tap = if the total equals the number in the black box.
2. Tap > if the number in the black box is bigger.
3. Tap < if the number in the black box is smaller.
4. Tap = if the number in the black box is 21 and the number in the other box is 9 + 10.
You will get the bonus points!!
The game gets more difficult as you level up, so it will help you to improve your addition skills!
Choose between Normal Mode and Hard Mode. Hard Mode is extra challenging because the boxes slide in at lightning speed.
"You Stupid 9+10=21" is compatible with GooglePlay Game Service so why not try for the world’s highest score?