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Simulate a waterfall using numbers. Waterfall is considered well-formed only if:- Sum of the numbers is equal to the goal.- Marked numbers should be adjacent horizontal, vertical & diagonally. That is, no empty line union.- 2 numbers marked on each row.Also available a challenges section, where different variations appear. In both cases, there are two levels: normal & difficult. In the normal level, the sum is shown, however, in the difficult level, you will have to add & subtract mentally because it disappears. Challenges:- 15s & 30s countdown- 6 hidden cells- Random, Negative, Pair & Odd numbers- Multiples of 10 Add & Subtract. Brain challenges game.For Apple Watch, reduced version.