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The standard form of this puzzle consists of a grid initially filled in with a number in every cell. Some of these cells are to be shaded such that no two adjacent cells are shaded, all the unshaded cells form a single orthogonally connected group, and no two unshaded cells in the same row or column contain the same number.
MIT Mystery Hunt 2007 Puzzle Editing
MIT Mystery Hunt 2008 Witness 1 Meta
MIT Mystery Hunt 2011 Nik-holey
MIT Mystery Hunt 2014 Magic Mushrooms