Rules: A red cell means addition, a blue cell means subtraction, a green cell means multiplication, and a purple cell means division. The number you add/subtract/multiply/divide by works like this: the first time you've been on the specific colour, you operate by 1, the 2nd time you operate by 2, the 3rd time you operate by 3, and so on. So the 1st red cell you add 1, the 2nd red cell you add 2, and so on. **You look at the colour of the cell you just answered! That is, the colour above the current cell**

## Show Comments