Print a fresh sudoku in seconds — classic 9×9, or kid-friendly 4×4 and 6×6 grids — in four honest difficulty grades. Every single puzzle is mathematically verified to have exactly one solution, and the answer key comes with the PDF.
No ads inside the puzzle — print it straight from your browser. Downloading the file asks for an email once.
Generate a sudoku now →A 26-page pack from easy to hard, every puzzle verified to have exactly one solution, answers at the back.
Free, and you can leave any time. No spam, ever.
Many free sudoku sites print puzzles with multiple solutions or mislabelled difficulty. PuzzleBindery generates each grid, then digs clues while re-verifying uniqueness at every step — the same engine used for published puzzle books.
The PuzzleBindery Book Studio batch-generates whole graded collections — for example 200 puzzles from Easy to Expert, four per page, with a compact solutions section — and exports a print-ready interior PDF for Amazon KDP. It's a one-time purchase, not another subscription.
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