Create custom sudoku puzzles for offline solving
Welcome to our free printable sudoku generator! This powerful tool allows you to create custom sudoku puzzles that you can print at home, save as PDF files, or download as images for offline solving. Whether you're a teacher preparing classroom materials, a parent looking for educational activities, or a sudoku enthusiast who prefers solving puzzles on paper, this generator has everything you need.
Grid Size: Choose from six different grid sizes, each with intelligent sizing that automatically adapts:
Difficulty Levels: Select from six carefully calibrated difficulty settings:
Total Pages: Generate 1-10 pages of puzzles, perfect for creating puzzle books or classroom sets.
Puzzles Per A4 Page: Choose your preferred layout density with smart spacing:
Include Solutions: Choose to exclude solutions, include them after each puzzle, or place them on separate pages for easy reference.
Real-Time Preview: See exactly what you'll get with our "what you see is what you get" preview system. Each A4 page is displayed at actual proportions with accurate spacing, fonts, and layouts. Multiple pages are shown vertically for easy review.
Smart Sizing: Our intelligent algorithm automatically calculates optimal puzzle sizes based on grid dimensions and layout density. Small grids (2×2, 4×4) get larger cells for easy reading, while large grids (16×16) use compact sizing to fit perfectly on the page.
Print Directly: Click the print button for immediate printing. Layouts are optimized for A4 portrait paper with minimal margins to maximize puzzle size while ensuring compatibility with all standard printers.
Multi-Page PDF: Generate professional PDFs where each preview page becomes a separate PDF page. Perfect for creating puzzle books, classroom handouts, or digital sharing while maintaining perfect print quality.
High-Resolution Images: Save all your puzzles as crystal-clear PNG images, ideal for presentations, websites, or digital documents. Images maintain their clarity when resized or printed.
Basic Rules: Fill each row, column, and (where applicable) sub-grid with the appropriate numbers without repetition. For 4×4 grids, use numbers 1-4; for 6×6, use 1-6; for 9×9, use 1-9; and for 12×12, use 1-12.
Solving Strategy: Start by looking for cells where only one number can fit. Scan each row, column, and sub-grid to eliminate possibilities. Use the process of elimination - if a number can only go in one place within a row, column, or sub-grid, place it there.
Advanced Techniques: For harder puzzles, try "naked pairs" (when two cells in a region can only contain the same two numbers) or "hidden singles" (when a number can only appear in one cell within a region, even though that cell has multiple possibilities).
Sudoku puzzles offer numerous cognitive benefits, making them excellent educational tools:
Classroom Activities: Teachers can generate puzzles for math warm-ups, brain breaks, or reward activities. Different difficulty levels accommodate various grade levels and abilities.
Family Fun: Create puzzle books for family game nights, car trips, or quiet time activities. The variety of sizes ensures everyone from young children to grandparents can participate.
Personal Challenge: Generate a week's worth of puzzles to solve during commutes, lunch breaks, or before bedtime. Track your solving times to monitor improvement.
Gifts and Activities: Create personalized puzzle books as thoughtful gifts for puzzle enthusiasts, or use them for party favors, waiting room materials, or retirement home activities.
Adaptive Scaling: Our advanced sizing algorithm automatically adjusts puzzle dimensions based on grid size and layout density. This prevents issues with tiny 16×16 grids or oversized 2×2 grids, ensuring optimal readability for every configuration.
Responsive Preview: The preview automatically scales to fit your screen size while maintaining accurate A4 proportions. On smaller screens, the preview scales down intelligently while preserving all layout details.
Memory Efficient: Generate up to 60 puzzles (10 pages × 6 puzzles per page) without performance issues. Our optimized code handles large puzzle sets smoothly on all devices.
Print Optimization: Layouts use minimal margins and optimal spacing to maximize puzzle size while ensuring compatibility with all standard printers. No content gets cut off, regardless of your printer's margin requirements.
Cross-Platform: Works perfectly on desktop, tablet, and mobile devices with all modern browsers (Chrome, Firefox, Safari, Edge). JavaScript required for full functionality.
Our advanced sudoku generator stands out with intelligent adaptive sizing that works flawlessly across all grid sizes from 2×2 to 16×16. Unlike basic generators that produce tiny, unreadable puzzles for large grids, our algorithm calculates optimal cell sizes for every layout configuration.
The live preview shows exactly what you'll print - no surprises, no formatting issues. Generate multiple pages instantly, preview them all simultaneously, then print or download with confidence. Everything is completely free with no registration, watermarks, or limits.
Our puzzles are algorithmically generated with guaranteed unique solutions and properly balanced difficulty levels. Each puzzle connects back to MiniSudoku.online where you can play interactive versions online.
Get started now: Adjust your settings above, click "Generate New Puzzle" to see the live preview, then print directly or download your preferred format. It's that simple!