Just as a fool can ask more questions than a thousand wise can answer, so too can a very simple idea turn into a difficult puzzle. A good example of this is Bloxorz: Roll the Block (only available online under the name Bloxorz). In this you have to get a block with a size of 1x1x2 units into a 1×1 hole and you can roll the block however you want. To succeed, you have to make sure that the block (sometimes via a detour) arrives at the hole in the correct orientation, which is often not easy. And… only the minimum number of moves will give you a top score.
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Bloxorz – Navigate the block to the hole.