Sudoku Sudoku Online Puzzles is made by Brian Hamilton and Karan Hamilton.
Brian builds and maintains the puzzle tools and site code. Karan helps with puzzle ideas, testing, wording, and the player experience.
Our Purpose
We publish Sudoku pages that should be useful to real players: playable puzzles, solver tools, printable PDFs, and practical guides that help people understand the rules and improve their solving.
Our standard is simple: a page should help the visitor do the thing they came for. If it is a game page, the puzzle should be clear and playable. If it is a solver or tool, the result should be accurate and understandable. If it is an article, the explanation should help a person make a better solving decision.
Who Creates the Pages
Most pages are written, built, or maintained by Brian Hamilton and Karan Hamilton. Author and reviewer details are shown on individual pages where they are most useful, and the author pages explain our background in puzzle sites, game design, web development, and player testing.
When a page uses a puzzle idea, rule set, or solving term that comes from the wider Sudoku community, we aim to describe it clearly and avoid presenting common puzzle knowledge as our own invention.
Game and Puzzle Pages
Playable Sudoku pages are checked in the browser for the core rules of the puzzle type, grid input, difficulty options, controls, saved progress where available, and common mobile and desktop interactions.
For Sudoku variants, we aim to explain what makes the variant different from classic 9x9 Sudoku before going into strategy. Rules should be visible enough that a new player can start without needing to search elsewhere.
For the detailed generation, solvability, uniqueness, difficulty, and correction process, see How We Make and Test Puzzles.
Solver and Tool Pages
Solver pages are tested against the relevant puzzle rules and example grids. For classic Sudoku tools, that includes row, column, and box constraints, duplicate detection, solving behaviour, and uniqueness checks where the page offers them.
Tools are meant to support puzzle solving and learning. They are not professional, financial, medical, legal, or safety advice, and we avoid wording that would imply otherwise.
Printable Puzzles
Printable pages and PDF packs are checked for usability on paper: the puzzle grid, difficulty label, answer key, page layout, and download links should all be clear.
We try to make printables suitable for personal, family, classroom, and club use unless a page states otherwise. If a printable does not fit the page or a solution key appears wrong, we want to hear about it.
Articles and Guides
Articles are written for puzzle players rather than for word count. We prefer concrete examples, plain-language explanations, diagrams where helpful, and links to related playable pages or deeper guides.
Strategy guides are reviewed for clarity and practical usefulness. If a solving step is confusing, incomplete, or misleading, we revise the explanation rather than leaving readers to guess what we meant.
Children and Family Use
Some pages are designed to be suitable for younger players and family use. Sudoku Online Puzzles does not require an account to play, does not include public chat, and does not rely on user-generated puzzle comments.
Where progress is stored, it is usually stored in the player's browser so the puzzle can continue on the same device. Our Privacy Policy and Cookie Policy explain data, cookies, local storage, analytics, and advertising choices.
Corrections and Updates
We update pages when we find a bug, improve an explanation, add a useful feature, change a puzzle tool, fix a broken link, or receive player feedback that helps make the page clearer.
Corrections may include fixing a rule, changing a diagram, improving accessibility, replacing a confusing paragraph, adjusting a puzzle generator, or updating a printable file. Important policy pages show their own last-updated dates.
Advertising and Independence
Sudoku Online Puzzles is free to use and may show advertising to help pay for hosting, maintenance, development, and writing. Advertising does not change the rules of a puzzle, the output of a solver, or the editorial conclusions in a guide.
If we ever publish sponsored content or affiliate recommendations, the page should make that relationship clear. The site is currently built around free puzzle play, tools, printables, and guides.
How to Report a Problem
If you spot a bug, puzzle problem, typo, broken link, unclear explanation, accessibility issue, or correction, please use our contact page.
Helpful reports include the page URL, the device and browser you used, the puzzle type or difficulty if relevant, and the steps needed to reproduce the issue.