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Get 1,2,3,4 numbers in a random order at easy level.
Get 1,2,3,4,5,6,7,8,9 numbers in a random order at medium level.
Get 1,2,3,...,14,15,16 numbers in a random order at difficult level.
Press a green cell to add 1 to numbers on all green cells.
Press a red cell to subtract 1 from numbers on all red cells.
Press a blue cell to pass the next steps without any adding or subtracting.
First number(1) can not decrease and last numbers(4,9,16) can not increase.