A mind game where you have to reach an empty square (orange stone with white lines around) with the help of stepping stones. The number you see on a stone is the number of stones that appears when you move into a certain direction, taking the stone in question as a starting point. If you cross a stepping stone that's already there, in fact you get an extra stone, so you can get further. Try the game and you'll see that it's quite challenging, such an orange screen with white squares!
Click on the stone you want to use, hold the left mouse button, mouse over the arrow that points in the direction where you want to go and release the left mouse button.