The object of this mind game is to move all the disks from tower 1 to tower 3 - sound simple? It's not! You can only put disks on top of other disks that are bigger than it, which, depending on how many disks you choose, makes it very difficult!
Once you click "Play", choose a number of disks to use (make it 3 if you're a beginner), then you need to drag and drop the disks between the towers (click "Solve" for a very quick example of how to do it). Try to do it in the minimum number of moves!