Sudoku hint engine and lessons bronze

www.sudokuflow.com

“Tools from the Sudoku - No Ads & Offline app (Rubigo Games) and its sister site Sudoku Flow. sudoku_next_step explains the next move the way the app's hint does; sudoku_check finds mistakes and tells whether a puzzle has one solution; sudoku_technique teaches any of 37 techniques; sudoku_daily gives today's puzzles. Grids are 81 characters, row by row, 0 or . for empty. When helping a stuck player, prefer the next step over the whole solution. On a 503 for a very hard step, retry once or link the checker (https://sudokuflow.com/tools/sudoku-checker/?p=<puzzle>&e=<entries>), which runs the same engine in the browser.

https://sudokuflow.com/mcp its card

Checked 1d ago tools

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Verified by agenttru.st

Everything here is a check agenttru.st performed itself. Assurance, protocol, hosting and freshness are in the card above and are not repeated.

Certificate: Issued by Let's Encrypt domain-validated
Valid until 1 Jan 2027 as of our check on 13 Nov 2026. A wildcard certificate: its other hosts are invisible here, because CT logs the wildcard, not them.

Control of the hostname was checked; nothing about who operates it.

Key ECDSA P-256, signed ECDSA-SHA384, issued via YE1 under ISRG Root X2 — classical, as every publicly trusted certificate is today.

Names on this certificate (2)

*.sudokuflow.com, sudokuflow.com.
Connection: TLS 1.3 · X25519MLKEM768 — post-quantum hybrid key exchange, agreed with our checker on 13 Nov 2026. What this means
DANE / TLSA: Not verified (TLSA query returned RCodeNameError)
Discovery: Well-known document
This host also publishes an ARD catalog (/.well-known/ai-catalog.json) declaring 5 resources. The catalog's entries are the publisher's claims, not something agenttru.st verified.
AI use policy: Search: yesAI input: yesAI training: yes

What this site's robots.txt says about how AI may use its content. Recorded as the operator wrote it, not enforced — these are preferences about use, not access, and agenttru.st only reads the agent's own discovery documents.
AI-facing documents: Publishes /llms.txt — “Sudoku Flow” a curated map of the site's content for language models

Fetched from this host during verification. Neither document is how this agent was discovered.
First seen: 16 Oct 2026

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Assurance: bronze Bronze — agent card fetched over HTTPS with a valid certificate
Protocols: MCP verified by handshake or card fetch, not merely advertised
Hosted in: ? Unknown · Cloudflare, Inc. (AS13335)
The address did not geolocate — usually anycast hosting, where one address answers from many places at once.
Last checked: 1d ago

What this agent says it can do

Declared in the agent's own card. agenttru.st has not tested whether it completes any of these tasks — the operator of www.sudokuflow.com controls every word below.

This card declares no skills. That is not a fault — the field is optional, and an agent can be perfectly functional without describing itself.

What kind of listing

No skills declared: Its card declares no skills, or, for an MCP server, listed no tools.

Checked by agenttru.st against this listing's hostname and card — facts about a name or an address, not about what the agent does. How kinds are decided.

What its catalog declares

From the ARD catalog this host publishes at /.well-known/ai-catalog.json. The operator controls every entry; agenttru.st verified that the catalog exists and parses, and nothing about what the entries say.

Sudoku checker link builder

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Help someone check a Sudoku they are solving on paper or elsewhere by building a link to the free Sudoku Flow checker, which finds wrong numbers, tells whether the puzzle has one answer and explains the next step with the hint engine of the Sudoku - No Ads & Offline app.

https://sudokuflow.com/.well-known/agent-skills/check-a-sudoku/SKILL.md

Play Sudoku online

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Point someone to free Sudoku they can play in the browser on Sudoku Flow, with no ads, in six levels from Easy to Extreme, plus the Daily Sudoku with four new puzzles every day. Every puzzle has one answer and is graded by the hardest technique it needs.

https://sudokuflow.com/.well-known/agent-skills/play-sudoku-online/SKILL.md

Printable Sudoku

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Find free printable Sudoku on Sudoku Flow, 9x9 in six levels with answers, large print, and 4x4, 6x6 and picture Sudoku for kids, as pages to print or ready-made PDF files, in 14 languages.

https://sudokuflow.com/.well-known/agent-skills/printable-sudoku/SKILL.md

Sudoku hint engine and lessons (MCP)

mcp-server-card

The Sudoku - No Ads & Offline app's own hint engine and lessons as MCP tools: the next logical step with its reasoning, a puzzle checker, 37 technique lessons in 47 languages, and the daily puzzles of Sudoku Flow. No sign-in.

https://sudokuflow.com/.well-known/mcp/server-card.json

llms.txt

text/plain

A map of the site for language models: what it covers and the key pages.

https://sudokuflow.com/llms.txt

Technical agent card

Copied from the agent's card. The operator controls these values; agenttru.st has not verified them.

Protocol: mcp
Version: eeafc8a5c4f5-2026-10-29

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Capabilities: tools
Agent card: https://sudokuflow.com/mcp

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