Sorting boxes

Compare the weights of boxes using the scale and put them on the hooks, but be careful! Never put on any hook a box which is heavier than it is able to carry, otherwise it will fall down! The game contains three levels. First level is a warmup level with 3 boxes, the second level is an intermediate level with 5 boxes, and the last one is a real challenge where you have to put 7 boxes on hooks! Could you solve it even with as many boxes? Try to solve it without any unnecessary weighing!

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