Disjoint Groups Sudoku
A challenging Sudoku variation where the same position in every 3x3 box must contain unique digits
Disjoint Groups Sudoku is a Sudoku variation that looks very similar to Classic Sudoku but can be surprisingly tough to solve. In this variant, the same position in every 3×3 box must contain the digits 1-9 exactly once — no number can repeat in the same position across the nine boxes. This creates 9 additional "disjoint groups" that act like extra constraints. This page contains links to all Disjoint Groups Sudoku puzzles and its variations published on this website.
Rules of Disjoint Groups Sudoku
Classic Sudoku Rules apply. Additionally, cells with the same position in 3×3 boxes must each contain the digits 1-9 exactly once — no number can repeat in the same position across the nine boxes.
Why Solve Disjoint Groups Sudoku?
- Experience a unique position-based constraint — each position in a 3×3 box forms its own group.
- Develop global grid awareness — you must track the same position across all nine boxes simultaneously.
- Master disjoint group logic — a powerful technique that appears in many advanced Sudoku variants.
- Enjoy 9×9 and 6×6 puzzles — suitable for all skill levels.
- Perfect for experienced Sudoku solvers seeking a fresh challenge.
- A great entry point into advanced Sudoku variants.
Key Techniques for Solving Disjoint Groups Sudoku
- Understand the disjoint groups — each position (e.g., top-left of a box) forms a group of 9 cells across the grid.
- Apply standard Sudoku logic — start with rows, columns, and boxes just like Classic Sudoku.
- Track disjoint group eliminations — once a digit is placed in a position, it cannot appear in the same position in any other box.
- Look for disjoint singles — if a digit can only go in one position across all boxes, place it.
- Combine with other techniques — use pointing pairs, X-Wing, and other advanced techniques.
- Check your disjoint sets — verify that each position contains 1-9 exactly once.
🔲 Disjoint Groups Sudoku (9×9) Puzzles
🔲 6×6 Disjoint Groups Sudoku Puzzles
🔲 Disjoint Groups Sudoku Variations
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Frequently Asked Questions
What is Disjoint Groups Sudoku?
Disjoint Groups Sudoku is a variation of Classic Sudoku where the same position in every 3×3 box must contain the digits 1-9 exactly once. This means each of the 9 positions (top-left, top-center, top-right, etc.) forms its own group of 9 cells across the grid, and no digit can repeat in the same position across the nine boxes.
How is Disjoint Groups Sudoku different from Classic Sudoku?
In addition to standard Sudoku rules (each row, column, and box contains 1-9), Disjoint Groups Sudoku adds the position constraint. The digit placed in a specific position within a 3×3 box must be unique across all nine boxes. For example, if you place a 5 in the top-left cell of one box, no other box can have a 5 in its top-left cell.
What sizes of Disjoint Groups Sudoku are available?
This collection includes both 9×9 and 6×6 Disjoint Groups Sudoku puzzles. The 6×6 puzzles are perfect for beginners and younger solvers, while the 9×9 puzzles offer more challenging puzzles for experienced solvers.
Where can I find more Sudoku variants?
The Sudoku Variations Main Page is the central index for all Sudoku variant types available on Fun With Puzzles. It covers a wide range of constraint-based variants and is the best place to discover new Sudoku challenges.
🔲 Find the disjoint groups — solve the Disjoint Groups Sudoku challenge! Try today's Daily Challenge!
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