Alafun Calculator 1

The goal of the game is to lead the opposite player to obtain a negative number on the indicator. The first player can push any of the nine keys thus decreasing the indicator number by the value of the pressed key. The second player can push any of the three keys in the column used by the first player, and then the first player can choose any key of the row previously used by the second player, and so on. The challenge is on.