SummeX is a casual math/puzzle game where you have quickly add up numbers to succeed.
Your goal is to shift rows up/down or left/right until the sum in the four squares are equal.
With increasing level additional numbers are added:
Level 1: Only 0 and 1
Level 2: 0, 1 and 2
up to Level 9
Your score is calculated from the number of moves and time needed, lower is better