NINE

Retire 2 números cuya suma total será de 9 como 1 + 8, 2 + 7, 3 + 6 o 4 + 5

This is a fun game which can improve mental arithmetic of people who play the game as they will have to press the right number at the right time. The concept of the game is simple where we have to remove 2 numbers whose total sum will be 9 like 1+8, 2+7, 3+6 or 4+5, any of the 4 possible combinations or their reverse will work