Sudoku Corner

Perfect for learning Sudoku basics. A 4×4 grid with 2×2 blocks where digits 1-4 appear once per row, column, and block.

• Quick 2-5 minute solves
• Learn fundamental strategies
• Great for kids and beginners

Step up from 4×4 with 6×6 grids featuring 2×3 blocks. Uses digits 1-6 and introduces more complex solving patterns.

• 5-10 minute average solve time
• Practice scanning techniques
• Bridge to full-size puzzles

The traditional 9×9 grid with 3×3 blocks. The worldwide standard that made Sudoku famous. Master this and you've mastered the classic.

• 15-30 minute typical solve
• Full range of strategies needed
• The definitive Sudoku experience

Classic 9×9 with an extra constraint: both main diagonals must also contain digits 1-9 without repeating.

• All classic rules apply
• Plus diagonal constraints
• More logical deductions required

Combines Sudoku with Kakuro. Cages show sums that their digits must add to, with no digit repeating within a cage.

• No givens—pure deduction
• Math and logic combined
• Highly challenging puzzles

Greater-than and less-than symbols between cells show relationships, adding an extra layer of logical constraints.

• Relational logic required
• Visual pattern recognition
• Unique solving techniques

Cells are shaded to indicate whether they must contain even or odd numbers, reducing possibilities early on.

• Visual cues for solving
• Parity-based deduction
• Faster initial eliminations

Marks show where adjacent cells contain consecutive numbers (like 3 and 4). Absence of a mark means non-consecutive.

• Negative constraint logic
• Pattern-based elimination
• Complex interactions

Instead of numbers, use colors or symbols. Same rules apply—each color appears once per row, column, and block.

• Visual and accessible
• Non-numeric solving
• Pattern recognition focus

A massive 16×16 grid using digits 1-9 and letters A-G. For the ultimate Sudoku challenge that can take hours.

• 256 cells to fill
• Extended character set
• Epic puzzle sessions

Specific rows, columns, or regions must sum to target values, combining arithmetic with standard Sudoku logic.

• Mathematical constraints
• Multi-step calculations
• Hybrid solving approach

Five overlapping 9×9 grids that share corners. Solve all five simultaneously using the overlapping constraints.

• 5 interconnected puzzles
• Cross-grid logic required
• Extended play sessions

Learn essential techniques from basic scanning to advanced patterns like X-wings, swordfish, and coloring.

• Step-by-step tutorials
• Illustrated examples
• Progressive difficulty

Practice with the interactive Sudoku app featuring multiple difficulty levels, hints, and automatic validation.

• Real-time error checking
• Built-in solver
• Multiple grid sizes

Browse curated collections of handcrafted puzzles with varying difficulties and specific technique focus areas.

• Categorized by technique
• Printable versions
• Solutions included