Rock-paper-scissors

Your objective is to 'clean the area' by eliminating items, until there is only one item left, and drop that into the 'sinkhole'.
As in the 'classic' game, a paper wins over a rock, scissors win over a paper, and a rock wins over scissors.
An item can only be moved to an adjacent location if it 'wins' over it, meaning that the target item is eliminated.
At difficulty level '1', you can get a hint on what item to move next, at difficulty level '3', the sinkhole will dissolve over time.