You are standing in the very corner of a 10 X 10 grid of dots. How many different ways are there to get to the opposite corner of the grid? You must travel through every node once, and only once. You cannot travel diagonally, and you may not go outside of the overall perimeter.
If the question is viewed in such a way that there is no space between grids of dots, the comment that there is not possible to move from left to right is correct.
Clarification from my point of view
