Sudoku Variants

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A Sudoku Variant is a puzzle that is a Variant of Sudoku.


What is a Variant?

It is debatable what constitutes a Sudoku variant and what is simply a Latin Square-related puzzle, such as Skyscrapers. In their book Sudoku Masterpieces, Thomas Snyder and Wei-Hwa Huang put forth the theory that for a puzzle to be a Sudoku variant, all of the cells (or a large majority of at least 90%) should be contained in at least three "Sudoku-ruled" regions. A "Sudoku-ruled" region is one where the region either has a constraint that no digit can appear more than once in the region, or each digit has to appear at least once in the region, or both (the most common type of "Sudoku-ruled" region).


Arguably not true variants, these puzzles are mathematically equivalent to Sudoku.


These are variants that change the size of the grid in a trivial way. One could consider all of these Irregular Sudoku, as none of them use the standard 3x3 box as regions.


These are variants that require the solver to understand mathematical properties of the digits.

Constraint Count Relaxation

These variants come from relaxing some of the fundamental rules of Sudoku

Additional Regions

These variants add additional "sudoku-like" regions.


These use different encodings of the digits 1-9, allowing for different set-theoretic constraints on what can be in a cell.


These use different geometric connections.


These use elements of Jigsaw Puzzles.


These involve some form of meta-puzzle solving.

Other Puzzles

These variants cross over with other puzzles.

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