Number Waterfall - Add and Subtract (Basic maths)

使用數字模擬瀑布，添加和減去。數學挑戰

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 and subtract mentally because it disappears.

Challenges:

- 15s & 30s countdown

- 6 hidden cells

- Random, Negative, Pair & Odd numbers

- Multiples of 10

Add and Subtract. Maths challenges

Compatible with Wear OS. Wear Game.

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