Can you move all the flour sacks, until only one is left?
Tap a sack to select it. Tap an empty hook. The empty hook must be two hooks from the selected sack in a horizontal or vertical direction AND the hook between the selected sack and the empty hook can not be empty. When the sack is moved, we remove the sack in the middle.
You win the game by ending up with only one sack left. The last sack must be placed on the hook in the middle of the Mill.