But first, tease your brain with a game!Here is three green frogs on the stumps on the left and the three brown frogs on the stumps on the right and an empty stump in the middleSee how quickly you can switch the frogs to the opposite side of the pond.Green frogs can only hop to the right. Brown frogs can only hop to the left. Frogs can only jump onto an empty rock. A frog can jump over one frog to an empty rock