About
About Toolwoven Sudoku Studio
Toolwoven Sudoku Studio makes printable Sudoku sheets: 4×4, 6×6 and 9×9 grids at three levels, 1 to 6 puzzles per page, A4 or US Letter, optional large print, and answer keys at the back.
How it works
Everything runs in your web browser. A complete grid is built from your seed, then clues are removed one at a time. Each removal is kept only if a backtracking solver still finds exactly one solution, and the finished puzzle is checked once more. A second, step-by-step logic solver then records the hardest technique the puzzle needs, which is shown in the batch check under the preview.
The same page model produces the on-screen preview, the print view, the SVG file and the PDF. The PDF is written by the page itself as vector lines and text in the built-in Helvetica font, so no file is uploaded and no outside service is used.
What the levels mean
Easy, Medium and Hard set how many clues remain (for 9×9: 42, 36 and 30). Clue count is only a rough guide to difficulty, so the levels table on the main page shows what the logic solver needed across a sample of 540 puzzles. The hardest puzzles here are below the “fiendish” level of specialist puzzle books.
Who makes it
Toolwoven Sudoku Studio is part of Toolwoven, a small independent collection of free browser tools. Each tool focuses on one practical task and can be used without signing up.
Read the privacy notice for what is stored on your device.
Last updated: 19 October 2026