Home › Variants

Sudoku Variants

Same one-per-line spirit, brand-new logic. Beyond classic Sudoku lies a whole family of variants — extra diagonals, overlapping regions, arithmetic cages and giant interlocked grids. Here's how each one works.

• Diagonal Sudoku (X-Sudoku)Play diagonal Sudoku, also called X-Sudoku: classic rules plus both main diagonals must contain 1–9. Free, with a worked example.
• Hyper Sudoku (Windoku)Play Hyper Sudoku, also called Windoku: classic rules plus four extra shaded 3×3 regions that must each contain 1–9.
• Killer Sudoku — guideLearn Killer Sudoku: classic rules combined with cages that sum to a target and never repeat a digit. The "rule of 45" explained.
• Jigsaw Sudoku (Irregular) — guideLearn Jigsaw Sudoku, also called Irregular Sudoku: the 3×3 boxes are replaced by irregular jigsaw-shaped regions that each contain 1–9.
• Samurai Sudoku — guideLearn Samurai Sudoku: five overlapping 9×9 grids that share corner boxes, played as one giant interlocked puzzle.