This can drive you crazy! Keep at it 'cause it is possible. This is one way to keep your mind sharp! It's a little 'test' that is (supposedly) part of a second grade Computer class in China . Some figure it out right away. Others report having to work on it for a week (or more) to solve it. Have fun.
Click here:
http://funstufftosee.com/frogleaptest.html