sudoku.com
Play Free Sudoku online - solve web sudoku puzzles
Last scanned Jul 24, 2026, 6:27 PM · 1 view
Overall score
Great
Summary
Play free Sudoku online from Easy to Expert level on Sudoku.com. This website uses Google Analytics hosted on Cloudflare behind Cloudflare CDN. SEO is good (85/100) and accessibility is good (85/100). Security scores good (75/100) and performance good (85/100). Top issue: No structured data (JSON-LD) found.
Play free Sudoku online from Easy to Expert level on Sudoku.com. Select a difficulty level of a web sudoku puzzle to challenge yourself and enjoy the game!
- United States
- Hosted on Cloudflare
Top issues to fix
7 issues found · 2 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
1 cookie without Secure/HttpOnly flags
SecuritySet Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
Missing OpenGraph tags
SEOAdd og:title/og:description/og:image so shared links render a proper preview card.
+1 more issue — details in the sections below.
SEO
2 issue(s) found
Performance
237 ms
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Organization
Company details published in this site's own structured data.
Play free Sudoku online from Easy to Expert level on Sudoku.com. Select a difficulty level of a web sudoku puzzle to challenge yourself and enjoy the game!
Contact
Email, phone, and address published on this site's own pages.
Source: https://sudoku.com/get-in-touch
Meta tags
- Title
- Play Free Sudoku online - solve web sudoku puzzles
- Description
- Play free Sudoku online from Easy to Expert level on Sudoku.com. Select a difficulty level of a web sudoku puzzle to challenge yourself and enjoy the game!
- Canonical
- https://sudoku.com/
- Language
- en
- Charset
- UTF-8
- Viewport
- viewport-fit=cover, width=device-width, initial-scale=1, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no
- Robots meta
- Manifest
- https://sudoku.com/manifest.json
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- Cloudflare
- CDN provider
- Cloudflare
- IP address
- 172.64.155.89
- ASN
- AS13335 (CLOUDFLARENET - Cloudflare, Inc., US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX |
|
| TXT |
|
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Google Trust Services
- Subject
- sudoku.com
- Valid from
- Jun 16, 2026
- Valid to
- Sep 14, 2026
- Days until expiry
- 51
- SAN domains
- sudoku.com, *.sudoku.com
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 2 cookie(s) observed
Content & assets
Headings
H1 1 · H2 2 · H3 1
Links
42 internal · 38 external · 0 broken
Images
9 total · 2 missing alt
Scripts / Styles
45 scripts · 2 stylesheets
JS / CSS size
2.7 MB · 19.9 KB
Page size
146 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 8
- sitemap.xml
- Found
- URLs in sitemap
- 413
SEO issues
- No structured data (JSON-LD) found
- Missing OpenGraph tags
Accessibility issues
- More than 20% of images are missing alt text
Scan details
- Requested URL
- https://sudoku.com
- Final URL
- https://sudoku.com
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 235 ms
- HTML size
- 146 KB
- Redirect chain
- https://sudoku.com
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Frequently asked questions
- What technology does sudoku.com use?
- sudoku.com is built with Google Analytics, Google Ads, Meta Pixel.
- Is sudoku.com secure (HTTPS)?
- Yes. sudoku.com uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Sep 14, 2026.
- Who hosts sudoku.com?
- sudoku.com is hosted on Cloudflare, behind Cloudflare CDN.
- What is sudoku.com's SEO score?
- sudoku.com scored 85/100 for SEO in the latest analysis (great).
- What is sudoku.com's overall website score?
- sudoku.com has an overall SiteGraph score of 83/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card