Sudoku has several variants that share core logic but change the constraints and solving style. Classic Sudoku is the baseline, while Killer, Jigsaw, Mini, Mathdoku, and Colour Sudoku each add a distinct challenge.
If you are choosing a mode to improve faster, start with classic for fundamentals, then branch into Killer or Jigsaw for stronger constraint tracking. Mini is ideal for short sessions, and Mathdoku builds arithmetic logic under row-column pressure.
Use this comparison as a quick way to pick the right variant for your goal: speed practice, relaxed sessions, competitive daily runs, or deeper deduction drills.
| Type | Grid size | Key rule | Difficulty | Best for |
|---|---|---|---|---|
| Classic Sudoku | 9x9 | Digits 1 to 9 once per row, column, and 3x3 box | Beginner to advanced | Core technique building |
| Killer Sudoku | 9x9 | Cage totals must match; digits cannot repeat in a cage | Intermediate to advanced | Constraint-heavy deduction |
| Jigsaw Sudoku | 9x9 | Irregular regions replace standard 3x3 boxes | Intermediate to advanced | Pattern adaptation |
| Mini Sudoku | 6x6 | Digits 1 to 6 once per row, column, and 2x3 box | Beginner to intermediate | Quick daily sessions |
| Mathdoku | Varies | Row and column uniqueness plus arithmetic cage targets | Intermediate | Mental math and logic |
| Colour Sudoku | 9x9 | Classic Sudoku logic using colours instead of digits | Beginner to intermediate | Visual solving rhythm |
Classic Sudoku is the best baseline for learning elimination and consistency. Solve each row, column, and box with no repeats. It scales naturally from beginner grids to competitive daily runs.
Play now: Daily Classic Sudoku and Classic Casual.
Killer Sudoku overlays cage sums on standard Sudoku rules, creating multi-constraint moves. Progress comes from cage combinations and row-column intersections. It rewards careful notes and sequencing.
Play now: Daily Killer Sudoku and Killer Casual.
Jigsaw Sudoku keeps row and column rules but swaps square boxes for irregular regions. The region geometry changes familiar scan patterns. It is ideal for players who want fresh structure without new digit rules.
Play now: Daily Jigsaw Sudoku and Jigsaw Casual.
Mini Sudoku compresses the puzzle into a fast 6x6 format. It keeps core logic while reducing solve time. It is useful for daily consistency and short focus sessions.
Play now: Daily Mini Sudoku and Mini Casual.
Mathdoku combines row-column uniqueness with arithmetic cage constraints. You solve with elimination plus number combinations. It is a strong variant for arithmetic-first logic players.
Play now: Daily Mathdoku and Mathdoku Casual.
Colour Sudoku uses standard Sudoku rules with colours in place of digits. It preserves logic while shifting the puzzle into a visual pattern experience. Many players find it an accessible speed-practice variant.
Play now: Daily Colour Sudoku and Colour Casual.