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A number grid where every row, column and box must contain each digit exactly once. No arithmetic is involved — only elimination.
Every puzzle is guaranteed to have exactly one solution, with difficulty that reflects real solving techniques — not just the number of blanks. Generate batch after batch for KDP sudoku books, brain-training packets for seniors, or daily logic warm-ups for the classroom, each with its solution grid. Puzzles can also be played in the browser, with pencil notes and live conflict checking, or shared as a link.
On 9×9, yes — after each number is removed the grid is solved again exhaustively, and if a second solution appears the number is put back. We do not run that check on 16×16: the search space makes it too slow in a browser. If you publish 16×16 puzzles, solve a sample first.
Not reliably. Two grids with the same number of givens can differ enormously depending on which techniques the gaps force. A 9×9 with a unique solution needs at least 17 givens — that part is a proven limit, not an estimate.
None. The digits are symbols; the puzzle would work identically with nine different letters.
Yes. Play has pencil notes built in and flags conflicting entries in red as you type.
Export as a US Letter PDF for print, or as PNG/JPG for image-based layouts. Amazon KDP supports multiple trim sizes, including 8.5 × 11 inches for applicable books; build the final interior to the trim size you selected and keep raster artwork at 300 DPI. There is also a grid-only export if you are dropping the puzzle into your own page layout.
This one can also be played in the browser: press Play above to solve it on screen, or Share to send a link that opens playable for whoever receives it — no account and no app at their end.
Or see all generators and ready-made templates.
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