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Sudoku247Online
Free online sudoku with Killer mode and Evil difficulty
Most free sudoku sites feel stuck in 2010 or buried in ads. Sudoku247Online is a clean, fast, no-signup web app with the classics plus Killer Sudoku, two new harder tiers (Master at 18-19 givens, Evil at the proven 17-given floor), and unlimited printable puzzles in multiple layouts. Features include a graduated hint system (Reveal Cell, Reveal Box, or free Show Candidates), full pencil-mark support with one-tap auto-fill, and a built-in sudoku strategy blog. Works on any device.
Hey Product Hunt 👋
I built Sudoku247Online out of frustration. Every free sudoku site I tried fell into one of three buckets: ad-stuffed, stuck in 2010, or capped difficulty at "Expert" — which isn't actually hard once you've been playing for a while.
The problem I wanted to solve: a clean, fast, no-signup sudoku app that respects both casual players AND people who want a real challenge.
What ended up shipping:
• Classic sudoku at 4 levels, plus two new harder tiers (Master at 18-19 givens, Evil at 17)
• Killer Sudoku with cage sums
• Unlimited printable puzzles (1, 4, or 6 per page)
• A graduated hint system — Reveal Cell, Reveal Box, or free Show Candidates — instead of one big "give me the answer" button
• A blog covering real solving techniques (Snyder notation, candidate mode, sudoku history)
The build itself evolved more than I expected. I started thinking "just make a clean sudoku" and ended up rabbit-holing into pencil-mark UX, hint psychology, and how world champions actually take notes (turns out it's the opposite of what most apps teach).
Would love feedback from puzzle fans here — especially anyone brave enough to try the Evil tier 😅
Try it: https://sudoku247online.com
About Sudoku247Online on Product Hunt
“Free online sudoku with Killer mode and Evil difficulty”
Sudoku247Online was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #154 on the daily leaderboard. Most free sudoku sites feel stuck in 2010 or buried in ads. Sudoku247Online is a clean, fast, no-signup web app with the classics plus Killer Sudoku, two new harder tiers (Master at 18-19 givens, Evil at the proven 17-given floor), and unlimited printable puzzles in multiple layouts. Features include a graduated hint system (Reveal Cell, Reveal Box, or free Show Candidates), full pencil-mark support with one-tap auto-fill, and a built-in sudoku strategy blog. Works on any device.
On the analytics side, Sudoku247Online competes within Web App, Puzzle Games and Games — topics that collectively have 225k followers on Product Hunt. The dashboard above tracks how Sudoku247Online performed against the three products that launched closest to it on the same day.
Who hunted Sudoku247Online?
Sudoku247Online was hunted by Paul Nees. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Sudoku247Online including community comment highlights and product details, visit the product overview.
Paul Nees