Duzzle description

Solve mathematical puzzles!

Through more than 120 levels, remove all numbers of each board.

If the sum is 6, select 1, 2 and 3 (1+2+3=6). They will decrement to 0, 1 and 2.
The 0 will disapeared.

The objective is to remove all numbers.

Tips : Choose bigger number at first.

Good luck!