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Puzzles such as Sudoku or Kakuro, where the final state of a pre-existing grid must be deduced logically through clues placed within and/or around the grid. Use with the [logical-deduction] tag. For puzzles where you are given a list of clues which can be used to compose a grid to solve them logically, use the [logic-grid] tag instead.

Puzzles where the final state of a grid must be deduced logically through clues placed within and/or around the grid. Common puzzles of this type include Slitherlink, Sudoku (and Sudoku variants), Kakuro, Nurikabe, and Masyu.

As a general rule, a question with this tag should provide the rules of the given puzzle (unless e.g. deducing the rules is part of the puzzle). Don't assume everyone knows how, say, a Nurikabe works! Answers should explain the logical solve path. The site requests that you upload your deductions along with the solution (and not just edited in after) so others can follow the solution and see how the answer was achieved.

Not to be confused with in which a set of clues about correspondences between different ways of describing the same set of objects can be used to compose and fill a grid to solve them.