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Sudoku variants
Learn what changes when the rules change.
A practical starting point
Compare standard Sudoku with variants adding constraints or connecting grids. Read each example's rules: a standard solver cannot verify every variant.
Sudoku variants guides
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A little more context
Questions about sudoku variants
Do all variants keep the usual rules?
Many do, but additional rules vary. Follow the specific row, column, box, diagonal or cage conditions stated with the puzzle.
Why does uniqueness matter?
A deliberately constructed puzzle should have one solution under its stated rules. Extra constraints or missing information can change the number of solutions.