The goal is to make the sum of numbers in each row and column be equal number in the box. So you have to rearrange numbers in the grid to make sum of numbers in a row or column equal to the number in the box.
Two game mode is available to play: classic and endless
In classic mode you can select difficulty and grid size.
In endless mode you will be given a 4x4 grid with normal difficulty at first. Grid size and difficulty will increase if you keep playing.
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