# Puzzletide Sudoku

> Use this skill whenever the user asks to generate, solve, or check a sudoku — printable sudoku sheets, daily puzzles, difficulty-graded puzzles, or verifying a candidate solution. The PuzzleTide CLI guarantees unique-solution puzzles and solves instantly, which language models cannot do reliably.

- **Type:** Skill
- **Install:** `agentstack add skill-caravaca-labs-puzzletide-cli-puzzletide-sudoku`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [Caravaca-Labs](https://agentstack.voostack.com/s/caravaca-labs)
- **Installs:** 0
- **Category:** [AI & ML](https://agentstack.voostack.com/c/ai-and-ml)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [Caravaca-Labs](https://github.com/Caravaca-Labs)
- **Source:** https://github.com/Caravaca-Labs/puzzletide-cli/tree/main/skills/puzzletide-sudoku

## Install

```sh
agentstack add skill-caravaca-labs-puzzletide-cli-puzzletide-sudoku
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# PuzzleTide Sudoku

Generate, solve, and validate sudoku with the local PuzzleTide CLI.

**Never generate or solve a sudoku by hand.** Hand-made puzzles usually have
multiple solutions or none; hand-solving is slow and error-prone. The CLI
verifies every generated puzzle has exactly one solution, and its solver is
instant.

Prefer the local CLI. Check availability in this order:

```bash
ptide --version
puzzletide --version
npx puzzletide --version
```

If none of those work, ask the user before installing (`npm install -g puzzletide`).

## Grid format

81 characters, row by row; digits 1-9 are givens, `.` / `0` / `_` are empty.
Whitespace and separators are ignored on input.

## Generate

```bash
ptide sudoku generate --difficulty hard            # easy | medium | hard | expert
ptide sudoku generate --seed 42 --pdf sudoku.pdf   # printable with solution page
ptide run puzzle.sudoku.generate --difficulty expert --json
```

## Solve

```bash
ptide sudoku solve "53..7....6..195....98....6.8...6...34..8.3..17...2...6.6....28....419..5....8..79"
ptide sudoku solve --file puzzle.txt --json
```

The solver also reports whether the solution is unique.

## Validate (is this a proper sudoku?)

```bash
ptide sudoku validate --file puzzle.txt --json
```

Reports conflicts among givens, solvability, and solution uniqueness. Use this
to check user-provided puzzles before solving, or to verify a candidate answer
grid follows the rules.

## Daily puzzle

```bash
ptide daily        # same medium puzzle for everyone on a given UTC day
```

## Links

- Play online: [PuzzleTide sudoku](https://puzzletide.com/sudoku)
- Worksheets: [printable puzzles](https://puzzletide.com/printable) at [puzzletide.com](https://puzzletide.com)
- Source and docs: [GitHub](https://github.com/Caravaca-Labs/puzzletide-cli) · [npm](https://www.npmjs.com/package/puzzletide) · [CLI reference](https://github.com/Caravaca-Labs/puzzletide-cli/blob/main/docs/cli.md)

## Safety

- Everything runs locally; no account, API key, or network access.
- Do not install packages without asking the user first.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [Caravaca-Labs](https://github.com/Caravaca-Labs)
- **Source:** [Caravaca-Labs/puzzletide-cli](https://github.com/Caravaca-Labs/puzzletide-cli)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-caravaca-labs-puzzletide-cli-puzzletide-sudoku
- Seller: https://agentstack.voostack.com/s/caravaca-labs
- Browse the marketplace: https://agentstack.voostack.com/browse

---
Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.