Magical Math Puzzle +/-0 (Plus or Minus Zero) is a new brain training puzzle game that is distinctly different from the other brain-dead games out there. Achieving the highest score all depends on what you choose to keep, and what you omit. This game truly tests your brains skills! CONNECT SAME NUMBER TILES! If the tiles are same color, the numbers are added. If the tiles are different color, the numbers are subtracted. These are the basic rules. It's easy and simple to play, but challenging t