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Kakuro Play

A playable cross-sum puzzle engine with hand-verified, uniquely-solvable layouts

Unify Dynamics LLC

Documentation
Tools7read-only
Sign-inNoneno account, no key
Data keptNoneprocessed in memory
PriceFreeoptional Pro limits
StatusLiveMCP + REST
Works withMCP · RESTany agent

Try asking

Real questions, and the tools your agent calls to answer them.

Let's play kakuro
Tools called
new_puzzle
Give me a cross-sum puzzle
Tools called
new_puzzle
Put a 7 in row 2, column 3
Tools called
set_cell
Give me a hint
Tools called
get_hint
Is this solved correctly?
Tools called
check_solution
Show me the solution
Tools called
solve
Show me the board
Tools called
render_board

About

Kakuro Play is a fully local, playable cross-sum (Kakuro) puzzle engine. new_puzzle generates a puzzle at a chosen difficulty (easy, medium, hard -- each a different hand-verified layout), freshly digit-relabeled and re-confirmed to have exactly one solution. set_cell fills or clears a cell, rejecting moves that repeat a digit within a run or push a run's sum past its clue. get_hint runs real combination cross-referencing -- intersecting a cell's across-run and down-run possible digit combinations -- and explains why the suggested value is forced. check_solution reports completeness and validity. solve runs the full backtracking solver and returns the unique answer grid. render_board draws the grid as text with clue lists. Stateless -- no server-side puzzle storage, the caller passes state between calls. Keyless; fully local; zero upstream calls; nothing stored.

Sources: Original, hand-authored content. Fully local, zero upstream calls.

Privacy

The publisher, Unify Dynamics LLC, states that tool inputs are processed in memory and not retained.

Data not collectedNo account, no profile, no stored prompts or results.
Privacy policyTerms

What it can do

7 tools, grouped by job. Every one is read-only or compute-only.

OpenAPI
Play2 tools
  • New puzzleGenerate a new Kakuro puzzle: a hand-verified layout, freshly digit-relabeled, with a mathematically confirmed unique solution.
  • Set cellFill or clear one cell.
Help3 tools
  • Get hintReturn one genuine logical deduction: a forced cell value and WHY it's forced (combination cross-referencing, or -- only if that doesn't apply --…
  • SolveRun the full backtracking solver on the puzzle's clues and return the unique answer grid -- for verification, or for a player who wants to see the…
  • Check solutionCheck whether the grid is complete and whether every run sums correctly with no repeated digits.
Info2 tools
  • Render boardRender the current grid as human-readable text with across/down clue lists.
  • Rules infoExplain Kakuro's rules, the difficulty levels, and how hints and generation work.

Information

PublisherUnify Dynamics LLC
CategoryGames & entertainment
LanguagesEnglish
Built forGlobal
CompatibilityAny MCP client · any agent · REST
Version0.1.0
MCP endpointhttps://kakuroplay.connectorbay.com/mcp
REST APIopenapi.json
SupportGet help · Status
CountryWorldwide

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Documentation

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What Kakuro Play is for

A fully local, PLAYABLE cross-sum (Kakuro) puzzle engine — puzzle generation with a confirmed unique solution, cell-by-cell move validation, real logical hints, and a full solver. Not a rules reference: it generates and lets you actually play real puzzle instances.

What it does

new_puzzle generates a fresh Kakuro puzzle at a chosen difficulty (easy, medium, hard — each a different hand-verified layout). Constructing an arbitrary Kakuro layout that is provably uniquely solvable is a hard combinatorial problem, so generation starts from a small set of hand-verified layouts and applies a freshly shuffled digit relabeling every call, re-confirming the result has exactly one solution with a real backtracking solve before returning it. set_cell fills or clears one cell, rejecting moves onto blocked cells, moves that repeat a digit within the same run, and moves that would push a run's sum past its clue or leave it unable to reach it. get_hint uses the classic Kakuro "combination cross-referencing" technique — it computes the possible digit combinations for a cell's across-run and its down-run and intersects them, revealing a forced digit whenever only one is possible in both — and only falls back to a solver-derived deduction if that doesn't apply anywhere. check_solution reports completeness and validity. solve runs the full backtracking solver and returns the unique answer grid. render_board draws the grid as text with the across/down clue lists.

How state works

There is no server-side game storage. Every call (other than new_puzzle and rules_info) takes the full puzzle state (the exact object returned by the previous call) and returns a new one.

What it is not

Not a rules-explainer or technique reference — it generates and lets you play real, fresh puzzle instances with genuine constraint-satisfaction logic behind every hint, validation, and solve.

Privacy policy

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Kakuro Play — Privacy Policy

Effective 28 September 2026. Unify Dynamics LLC ("we", "us"), Menlo Park, California.

What Kakuro Play is. Kakuro Play is a connector (an MCP server and REST API) that AI assistants and personal agents call on your behalf to run a local, playable cross-sum puzzle engine — generating puzzles, checking cell entries, computing hints, and solving.

What we receive. The arguments of each tool call — the puzzle state you (via your assistant) pass back on every call, your requested moves and difficulty, and the technical headers needed to serve the request (an IP address or a client identifier supplied by the assistant, and a Pro API key if you have one) — plus standard server logs.

Everything is computed locally and nothing is stored. Kakuro Play has no database and no server-side puzzle storage of any kind. The entire puzzle state lives only in your conversation with your assistant, which passes it back to us on each call and receives an updated copy in the response. We do not persist it, log it, or use it for anything beyond computing that one response. No request is forwarded to any third party — there is no upstream call at all.

What we do not receive or store. We do not receive your name, your conversation with the assistant beyond the bare puzzle-state argument, or anything else about you. Each request is answered independently. Rate-limit counters (a client identifier and timestamps) are held in memory for at most 24 hours. Hosting-provider access logs (IP addresses and request paths, not request bodies) are retained for up to 30 days for security and abuse prevention.

Sub-processors. None — computation is entirely local to this server. Hosting: Vercel (United States regions).

Legal bases and your rights. Our processing is necessary to provide the service you request through your assistant. Because we store no personal data beyond short-lived logs, requests to access, correct or delete personal data are usually satisfied automatically; you can still contact agent@connectorbay.com and we will respond within 30 days. We do not sell or share personal information and do not use your data to train models.

Children. Kakuro Play is a general-audience service operated by the adult using the assistant.

Changes. We will post changes here with a new effective date.

Terms of service

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Kakuro Play — Terms of Service

Effective 28 September 2026. These terms govern use of the Kakuro Play connector ("the Service") operated by Unify Dynamics LLC ("we", "us").

  1. The Service. Kakuro Play is a stateless, playable cross-sum (Kakuro) puzzle engine — puzzle generation, move validation, hints, and a solver — accessed through an AI assistant or directly over MCP or HTTP. There is no server-side game storage: the caller holds and passes puzzle state between calls.
  2. Entertainment only. Kakuro Play is provided for entertainment purposes. Nothing in it constitutes advice of any kind.
  3. Acceptable use. Automated use within the published rate limits is welcome. Do not use the Service to disrupt, overload, or reverse-engineer the underlying infrastructure.
  4. Availability. The Service is provided "as is" without warranty. We may change, limit, or discontinue it at any time.
  5. Data. Our Privacy Policy describes what we process. In short: puzzle state is computed statelessly from what you send us and nothing is stored.
  6. Pro keys. Optional Pro API keys are issued at our discretion, are personal to the holder, and may be revoked for abuse.
  7. Liability. To the fullest extent permitted by law, Unify Dynamics LLC is not liable for any loss, injury, or damage arising from use of, or reliance on, the Service. Our total liability is limited to US $100.
  8. Governing law. California law; venue in San Mateo County, California.
  9. Contact. Unify Dynamics LLC · agent@connectorbay.com · https://connectorbay.com/kakuroplay

Support

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Kakuro Play support

Email agent@connectorbay.com. We answer within two business days.

When you report a problem, include the question you asked your agent, roughly when, and which agent you used (for example Claude, ChatGPT or Gemini). Never send us passwords, account numbers or ID numbers. Kakuro Play never asks for them.

Get Kakuro Play

Free · No sign-in · Read-only

Streamable HTTP, stateless, no authentication. Paste the endpoint into any MCP-capable agent.

https://kakuroplay.connectorbay.com/mcp
{
  "mcpServers": {
    "kakuroplay": {
      "type": "http",
      "url": "https://kakuroplay.connectorbay.com/mcp"
    }
  }
}