Website readiness profile · Snapshot 23 October 2026
sudoku.com
sudoku.com's public homepage, certificate and DNS checked against 31 practices and compared with 522 Puzzles & Video Games sites.
- Readiness index
- 74/100
- Ahead of
- 87%
- Practices observed
- 20/30
- Popularity band
- Top 5K
Puzzles & Video Games median 60
of measured Puzzles & Video Games sites
1 of 31 could not be measured
Chrome UX Report top-sites list
Readiness by lane
Green: sudoku.com. Thin bar: Puzzles & Video Games peer median.
Enable
82/100
Peers 74
Harden
80/100
Peers 50
Accelerate
63/100
Peers 60
Recover
0/100
Peers 7
Priority fixes for sudoku.com
Ordered by impact and by how common each practice is among peers.
Priority 1 · Accelerate
No render-blocking scripts in <head>
Observed: The homepage <head> loaded 1 external script without async or defer.
Why it matters: A plain <script src> in the head stops the browser from showing anything until that file has downloaded and run.
What to do: Add defer to scripts that need the DOM, async to independent ones such as analytics, or move them to the end of the body.
52% of Puzzles & Video Games peers do this. Limit: Based on the homepage HTML delivered to an automated client; scripts that run later were not executed.
Guide: Control Third-Party Scripts Before They Control Your Page
Priority 2 · Accelerate
Modern image formats in use
Observed: The homepage had 11 images and none used WebP or AVIF.
What to do: Serve WebP or AVIF with a JPEG or PNG fallback, either through an image CDN or by generating both formats at build time.
On Cloudflare: Cloudflare Polish can convert images to WebP.
32% of Puzzles & Video Games peers do this.
Guide: AVIF, WebP, JPEG, and PNG: Choose the Right Image Format
Priority 3 · Accelerate
Offscreen images lazy-loaded
Observed: The homepage had 11 images and none used loading="lazy".
What to do: Add loading="lazy" to images below the fold. Do not lazy-load the main hero image, because that delays the largest visible element.
46% of Puzzles & Video Games peers do this.
Priority 4 · Enable
Social preview image set
Observed: The homepage had no og:image, so shared links may show without a preview image.
What to do: Add Open Graph tags, including og:image with a 1200 x 630 image.
59% of Puzzles & Video Games peers do this.
What sudoku.com already does well
Practices fewer than half of Puzzles & Video Games peers use.
- DNSSEC signedDNSSEC delegation (DS record) present.8.2% of peers
- Content Security Policy presentContent-Security-Policy present.17% of peers
- DMARC policy enforces quarantine or rejectDMARC policy p=quarantine.21% of peers
What we saw
- Homepage checked
- https://sudoku.com/
- Homepage response
- HTTP 200
- TLS
- TLSv1.3, HTTP/2
- Certificate
- Google Trust Services, 90-day validity, expiring 2027-01-11
- CDN or edge
- Cloudflare
- DNS operators
- Cloudflare
- HSTS
- max-age 365 days
- DMARC policy
- p=quarantine
- Homepage HTML
- 154 KB, br
- Images on homepage
- 11 (png 10, svg 7)
Limits: homepage only, one location, one moment. Header checks reflect the homepage response; other pages may differ.
Stack and providers
Seen in the homepage response, certificate and DNS. Provider pages compare how their customers configure the same checks.
All 31 checks
Select a gap for the method and fix. How each check works
Not observed 10
Observed 20
- HTTP requests move to HTTPS
- HSTS kept for at least a year
- TLS 1.3 negotiated
- Certificate has more than 14 days left
- Certificate lifetime of 100 days or less
- DNSSEC signed
- DMARC policy enforces quarantine or reject
- Framing restricted
- Content Security Policy present
- HTTP/2 negotiated
- HTTP/3 advertised
- HTML compressed
- Static files cached for 30 days or more
- XML sitemap discoverable
- Reachable over IPv6
- Canonical URL declared
- Meta description written
- Mobile viewport configured
- Page language declared
- At most one redirect to the homepage
Not measured 1
- robots.txt published
Own sudoku.com?
Re-run the checks after a change, keep a private action plan in a free workspace, or report a mistake.
Live status for this site: Status Is Down: sudoku.com. This profile covers configuration only.