Puzzle Cottage
What you get with Puzzle Cottage Sudoku
Free
Free forever, no account. No email asked before play, no credit card on file, no “trial” that converts to a subscription. Streaks save locally in your browser.
Daily
A new puzzle every day at midnight in your local timezone. Same puzzle for every player worldwide, so streaks are real and shareable.
Levels
Easy, Medium, Hard on every daily puzzle — pick whichever fits your mood. Easy is approachable for someone returning to Sudoku after years; Hard demands real technique (X-wing, hidden triples).
Archive
Every past daily puzzle stays free. Use the Sudoku archive to replay any previous day’s puzzle — no subscription required.
Tools
Pencil marks for candidate notes, a pause button (with a grid-cover overlay so you can’t peek), an undo, and chimes when you complete a row, column, or 3×3 box.
No-ads
No ads inside the grid. Display ads sit in the page margins to keep the site free, but the puzzle area stays clean — no popups, no auto-play video, no interstitials between cells.
A free Sudoku that respects your attention. Daily 9×9, three difficulties, full archive, no subscription.
Free Sudoku online vs. NYT Sudoku
NYT Sudoku is genuinely excellent — it’s the gold standard for daily Sudoku presentation. The trade-off is access:
| Feature | Puzzle Cottage | NYT Sudoku |
|---|---|---|
| New puzzle daily | Yes | Yes |
| Three difficulty levels | Yes (Easy / Medium / Hard) | Yes |
| Sign-up required | No | Yes (NYT account) |
| Past-puzzle archive | Free, full archive | NYT Games subscription |
| Pencil marks | Yes | Yes |
| Pause | Yes (with peek-proof overlay) | Yes |
| Other daily puzzles included | 10 more (Wordle-style, Connections, more) | Behind same subscription |
| Price | Free | $7.20/mo for archive |
Free Sudoku for seniors
Sudoku is the most-searched brain game for older adults — and the research backs the choice. The 2003 NEJM study (Verghese) found logic-puzzle solvers 4+ times per week associated with 47% lower dementia incidence. The 2019 PROTECT study (19,078 adults) found regular puzzle solvers performed at a brain-age 8–10 years younger on memory tests.
Puzzle Cottage Sudoku is well-suited for seniors specifically:
- High-contrast text and large tap targets — readable on phones, tablets, and laptops.
- Pinch-to-zoom works everywhere — no fixed-size grid that breaks at zoom.
- No time pressure unless you want it — the timer can run silently in the background or be paused.
- Pencil marks let you note candidates without holding 8 possibilities in your head.
- The pause button covers the grid with an opaque overlay, so a phone call won’t leak progress.
For more on senior-friendly play, see brain games for seniors.
Sudoku tips when stuck
The skill ceiling on Sudoku is high — expert puzzles require techniques like X-wings, swordfish, and forcing chains that take years to internalize. But the most common reason for getting stuck is much simpler: missing a naked single. That’s a cell where only one number can go because the row, column, and 3×3 box have already used the other eight.
Three quick checks before you start placing pencil marks:
- Scan each row — any cell where 8 of the 9 needed numbers are already in the row, column, or box?
- Scan each 3×3 box — any number that can only fit in one cell?
- Step away. Studies show fresh eyes after a 10-minute break solve faster than continuous staring.
For the full strategy progression, see our Sudoku tips guide.
Other free puzzles on Puzzle Cottage
Sudoku pairs well with these other daily logic and word puzzles:
Unfold
Spatial reasoning — predict hole positions in folded paper. 5 difficulty tiers.
Connections
Group 16 words into 4 hidden categories. Free NYT Connections alternative.
Word Scramble
Wordle-style 6-letter guessing with color hints.
Anagram Race
Find 5 valid words from 6 letters as fast as you can.
Math Sprint
60-second mental arithmetic challenge.
Mini Crossword
Daily 5×5 crossword. Free NYT Mini alternative.
Start your streak
Frequently asked questions
Is there a free Sudoku online with no sign-up?
Yes — Puzzle Cottage Sudoku is free, requires no account, no email, no app install. Streaks and progress save in your browser. Three difficulty levels with pencil-mark candidates. Every past daily puzzle stays free in the archive.
Can I play unlimited Sudoku online for free?
Yes. The past-puzzle archive lets you replay every previous daily Sudoku for free, and you can also restart today’s puzzle at any time. There’s no daily limit, no paywall, no ad-watch requirement.
Is Sudoku at Puzzle Cottage really ad-free?
There are no ads inside the Sudoku grid itself — no popups, no auto-play video, no interstitials between puzzles. Display ads appear in the margins around the gameplay area to keep the site free, but the puzzle area stays clean.
Is there free Sudoku for seniors?
Yes — Puzzle Cottage Sudoku has clear high-contrast text, large tap targets, browser-native zoom support, and no time limit unless you start a timer yourself. Easy mode is gentle enough for someone returning to Sudoku after years away.
What’s the difference between this and NYT Sudoku?
NYT Sudoku is excellent and well-presented, but it requires a NYT Games subscription ($7.20/month) for the full archive and is gated behind an account. Puzzle Cottage Sudoku is free forever, no subscription, no account, with the same three difficulty levels.
Does it have pencil marks / candidate notes?
Yes. Tap the pencil icon to enter candidate-note mode, then tap numbers to mark possible values for each cell. Tap the pencil icon again to return to normal entry mode.
Can I play Sudoku offline?
Yes. Puzzle Cottage installs as a Progressive Web App (PWA). On iOS Safari, tap Share → Add to Home Screen. On Android Chrome, accept the install prompt. Once installed, today’s Sudoku plays offline.
How are the daily Sudoku puzzles generated?
Algorithmically, with seeded backtracking. The same date produces the same puzzle for every player worldwide, so streaks and leaderboards are comparable. The generator targets specific difficulty thresholds so Easy stays approachable and Hard stays challenging.
Is there a Sudoku for kids version?
Easy mode is approachable for older kids learning Sudoku basics. We don’t currently offer a 4×4 or 6×6 kid variant — those are on the post-launch roadmap.
What about Sudoku variants — Killer, X, Samurai?
Currently we offer classic 9×9 only. Killer Sudoku, Sudoku X (diagonal), Hyper, and Samurai are under consideration if classic Sudoku attracts an audience.