Sudoku for Kids (4×4)
Free printable 4×4 sudoku for kids — a gentle introduction to sudoku using the numbers 1 to 4. Great for classrooms and quiet time. Play online, print, or download as a PDF.
Click a cell, then type a number (or use the pad).
Explore the The Sudoku Family & Grid Variations
Explore the full range of Sudoku variations — from classic 9×9 grids to diagonal constraints, cage sums, irregular polyominoes, and word-based puzzles.
Classic Sudoku
Guaranteed unique-solution puzzles across 5 difficulties
Learn How to Play, Solve & Teach Sudoku for Kids (4×4)
How to Solve Sudoku: A Beginner's Guide (No Math Required)
New to sudoku? Learn the one rule, the simple scanning techniques, and a step-by-step method to solve any beginner puzzle — no math needed. Play free online or print a puzzle with its answer key.
What Is Sudoku X? Diagonal Sudoku Explained
Sudoku X adds two diagonal constraints to classic sudoku, making every clue count for more. Learn the rules, why the diagonals change how you solve, and generate free printable Sudoku X puzzles with a unique solution.
Large Print Puzzles for Seniors: Benefits, Solving Tips, and Free Printables
Discover the cognitive benefits of large print puzzles for seniors and low-vision solvers. Learn how oversized high-contrast grids support brain health, reduce eye strain, and explore free printable Sudoku and Word Searches.
Frequently asked questions
Is the sudoku generator free?+
Yes. Generate unlimited sudoku puzzles and print or download them for free, no signup needed.
Does every puzzle have one solution?+
Yes. Each generated sudoku is guaranteed to have exactly one unique solution.
What difficulty levels are available?+
Five: Easy, Medium, Hard and Expert on the classic 9×9 grid, plus a gentle 4×4 version for kids.
Can I solve the sudoku online?+
Yes. Click a cell and type a number; the tool highlights conflicts, and you can Check your progress or Reveal the solution.
How do I print the sudoku?+
Use Preview & Download to save a US Letter or A4 PDF with the puzzle and its answer key.