One of the standard puzzle types with this name is one like the 15 puzzle, where a set of square blocks are able to slide around in a frame which has a hole exactly as large as one of the pieces, and the object is to get the pieces into some sort of order. There are also similar puzzles (sometimes called sliding block puzzles) in which the hole may be two or more cells in size, and the blocks may be more than one cell also; in this type, often the object is to get one particular block to a particular location.
Puzzles
MIT Mystery Hunt 1996 6C
MIT Mystery Hunt 2008 Rotating Slider
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