gave it 10 minutes but couldnt get past the first one still (is it 4 3 2 1 or 1 2 3 4 or 3 2 1 0 coz i cant see any green trees). please let the designer know that having the very first puzzle to be based on environmental is a cardinal sin - because most of us expect an easy access to a battery as the starting puzzle~~~ ill be back again when undo is available/puzzle is made easier.