Hard Sudoku Printable
Hard sudoku printables are for solvers who want fewer starting numbers and more deduction. This preset opens on a challenging 9×9 puzzle that still has exactly one solution — generated and checked in your browser, not copied from a random image online.
Use the controls below for Letter or A4, large-print cells, or multiple puzzles per sheet. New puzzle shuffles the grid while keeping your difficulty choice. Download PDF for the blank puzzle and a full answer key on the next page. Print at 100% with scaling off.
Puzzle preview
9×9 · Hard · 1 per pageWhat you need for sudoku on paper
- A basic home inkjet or laser printer — print at 100%, scaling off (opens in new tab)
- Letter-size copy paper (32 lb) for crisp lines and margins (opens in new tab)
- Black ink or toner cartridges matched to your printer (opens in new tab)
- Large-print sudoku puzzle books for extra grids between printouts (opens in new tab)
- Mechanical pencils with erasers for clean number changes (opens in new tab)
- A clipboard or lap desk so the sheet stays flat on the couch (opens in new tab)
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