What powers 
websudoku.com?
Last seen Oct 2026 · 30 technologies across 12 categories
Advertising
Analytics
CDN
Cookie compliance
JavaScript libraries
Operating systems
Programming languages
Security
Tag managers
Web frameworks
Web server extensions
Web servers
AI Crawlers
No robots.txt, so all AI crawlers are allowed by default. Checked Nov 2026.
- robots.txt not found
- llms.txt not found
- ai.txt not found
Top search keywords
| Keyword | Position | Est. monthly visits |
|---|---|---|
| sudokus | #3 | 21,800 |
| free web sudoku easy | #1 | 1,100 |
| sudoku puzzle | #2 | 670 |
| simple sudoku puzzle | #2 | 580 |
| web sudoku evil | #1 | 550 |
| how to play sudoku | #10 | 410 |
| sudoku puzzles | #60 | 210 |
| web sudoku medium | #1 | 200 |
| sudoku hard | #2 | 170 |
| websudoku.com hard | #1 | 160 |
| sudoku printable | #8 | 160 |
| sudoku easy | #3 | 150 |
| online su | #2 | 140 |
| web sudoku deluxe | #1 | 120 |
| online sudoku | #2 | 88 |
| sudoku billions evil | #1 | 79 |
| hards | #77 | 78 |
| evil sudoku | #1 | 75 |
| sudoku 247 | #6 | 75 |
| sudoku game | #4 | 67 |
| sudoku solver | #95 | 64 |
| sudoku free | #3 | 53 |
| millions of sudoku | #1 | 52 |
| sudoku million | #1 | 52 |
| medium difficulty sudoku | #2 | 52 |
The site's top keywords in Google (US), with the visits each one is estimated to bring per month.
Top backlinks
Top links pointing at the site, one per source domain, strongest first. The anchor text opens the page carrying the link.
AI Crawlers
No robots.txt, all AI crawlers allowed
Audience
- 48% desktop
- 46% phone
- 5% tablet
United States
United Kingdom
Canada
Australia
India
France
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
5.47 / 10 · ranked #162,490 of all domains
295 referring domains · OpenPageRank
Search traffic
29,700 est. monthly organic visits (US)
1,791 keywords in Google's top 30
Core Web Vitals
| LCP | 2 s |
| INP | 75 ms |
| CLS | 0.05 |
| TTFB | 600 ms |
Real user p75, Chrome UX Report, Oct 2026.
Page
- Weight: 0.4 MB · 22 requests
Homepage as crawled by the HTTP Archive, Oct 2026.
Organisation
- Web Sudoku
- Founded: 2005
From Wikidata (CC0).
Infrastructure
- Registered May 2005 (21 years) via GoDaddy.com, LLC, renews May 2030
- Hosted on PAIR-NETWORKS - pair Networks (66.39.22.227)
- DNS: ns0.com
- Email: pair.com
- Email security: SPF (soft fail), no DMARC record
- SSL: Sectigo, RSA 2048, wildcard, expires May 2027
- Common Crawl link graph: rank 49,554, 23 hosts
DNS records as swept Nov 2026, certificate as seen Nov 2026, registration from the registry's RDAP service. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| en2.websudoku.com | 24 |
| es2.websudoku.com | 24 |
| de.websudoku.com | 7 |
| en.websudoku.com | 7 |
| es.websudoku.com | 7 |
| five.websudoku.com | 7 |
| four.websudoku.com | 7 |
| fr.websudoku.com | 7 |
| east.websudoku.com | 6 |
| grid.websudoku.com | 6 |
| nine.websudoku.com | 6 |
| show.websudoku.com | 6 |
| view.websudoku.com | 6 |
| websudoku.com | 6 |
| west.websudoku.com | 6 |
| www.websudoku.com | 6 |
| play.websudoku.com | 4 |