puzzle-arcade-server 0.2

Multi-game puzzle server for telnet - LLMs with MCP solvers welcome!

Puzzle Arcade Server

A multi-game puzzle server hosting 16 different logic puzzle types, built using the chuk-protocol-server framework. Perfect for demonstrating LLM reasoning capabilities and constraint solver generality!

Try It Now

A live demo server is running on Fly.io. Try it instantly:

# Connect via Telnet (IPv6)
telnet 2a09:8280:1::b8:79f4:0 8023

# WebSocket connections
ws://puzzle-arcade-server.fly.dev:8025/ws

Once connected, type help to see available games, or sudoku easy to start playing!

Features

• 16 Puzzle Games with three difficulty levels each (easy, medium, hard)
  • 7 Classic Logic Puzzles - Sudoku, KenKen, Kakuro, Binary, Futoshiki, Nonogram, Logic Grid
  • 4 Advanced CP-SAT Puzzles - Killer Sudoku, Lights Out, Mastermind, Slitherlink
  • 2 Optimization Challenges - Knapsack, Task Scheduler
  • 3 Advanced Reasoning Puzzles - Nurikabe, Einstein's Puzzle, Minesweeper
• Multiple transport protocols:
  • Telnet (port 8023) - Classic telnet protocol
  • TCP (port 8024) - Raw TCP connections
  • WebSocket (port 8025) - Modern WebSocket protocol
  • WebSocket-Telnet (port 8026) - WebSocket with telnet negotiation
• Interactive menu-driven interface with game selection
• Hint system for when you're stuck
• Solution checker and auto-solver for all games
• Clean ASCII art grids - perfectly aligned for easy parsing
• Comprehensive test suite (450 tests, 95% coverage)
• Modern Python best practices:
  • Pydantic v2 native - All models use ConfigDict for type safety
  • Async native - Full async/await support throughout
  • Type-safe - No dict["key"] patterns, only typed models
  • Enum-based - No magic strings, proper enum constants
• Modern Python packaging with pyproject.toml
• Docker and Fly.io deployment ready

Available Games

Classic Logic Puzzles

Game	Grid Size	Constraint Types	Status
Sudoku	9×9	AllDifferent (rows, cols, boxes)	✅ Complete
KenKen	4×4 to 6×6	Arithmetic cages + AllDifferent	✅ Complete
Kakuro	5×5 to 8×8	Sum constraints + AllDifferent	✅ Complete
Binary Puzzle	6×6 to 10×10	Adjacency limits + Equal counts	✅ Complete
Futoshiki	4×4 to 6×6	Inequalities + AllDifferent	✅ Complete
Nonogram	5×5 to 10×10	Line sum constraints + Blocks	✅ Complete
Logic Grid	Variable	Category associations + Logic	✅ Complete

Advanced CP-SAT Puzzles

Game	Grid Size	Constraint Types	Status
Killer Sudoku	9×9	Linear constraints + AllDifferent + Cages	✅ Complete
Lights Out	5×5 to 7×7	Boolean XOR constraints (SAT)	✅ Complete
Mastermind	4-6 pegs	Deduction + Feedback constraints	✅ Complete
Slitherlink	5×5 to 10×10	Global loop + Edge constraints	✅ Complete

Optimization Challenges

Game	Problem Size	Constraint Types	Status
Knapsack	5-12 items	Value maximization + Capacity constraint	✅ Complete
Task Scheduler	4-8 tasks	Makespan minimization + Dependencies + Resources	✅ Complete

Advanced Reasoning Puzzles

Game	Grid Size	Constraint Types	Status
Nurikabe	6×6 to 10×10	Connectivity + Island sizes + No 2×2 blocks	✅ Complete
Einstein's Puzzle	5 houses × 5 attributes	Multi-attribute deduction + Logic chains	✅ Complete
Minesweeper	6×6 to 10×10	Probabilistic reasoning + Safe deduction	✅ Complete

Quick Start

Prerequisites

• Python 3.11 or higher
• UV (recommended) or pip

Installation

From Source (Development)

Using UV (Recommended)

# Clone the repository
git clone https://github.com/chrishayuk/puzzle-arcade-server.git
cd puzzle-arcade-server

# Install UV if you haven't already
curl -LsSf https://astral.sh/uv/install.sh | sh

# Install development dependencies
make dev-install

# Run the server
make run

Using pip

# Clone the repository
git clone https://github.com/chrishayuk/puzzle-arcade-server.git
cd puzzle-arcade-server

# Install in development mode with dev dependencies
pip install -e ".[dev]"

# Run the server
PYTHONPATH=. uv run --with chuk-protocol-server chuk-protocol-server server-launcher -c config.yaml

Using Make (All Commands)

# See all available commands
make help

# Development workflow
make dev-install      # Install dev dependencies
make run              # Run the server
make test             # Run tests
make test-cov         # Run tests with coverage report
make check            # Run linting and type checking
make format           # Format code with ruff
make security         # Run security checks

# Docker workflow
make docker-build     # Build Docker image
make docker-run       # Run in Docker container

# Examples
make example-telnet              # Browse games via telnet
make example-telnet-sudoku       # Sudoku demo
make example-telnet-kenken       # KenKen demo
make example-ws                  # WebSocket tour
make example-ws-interactive      # Interactive WebSocket mode

# Deployment
make fly-deploy       # Deploy to Fly.io
make fly-logs         # View Fly.io logs

Docker Setup

Build and run with Docker:

# Using Make
make docker-run

# Or manually
docker build -t puzzle-arcade-server .
docker run -p 8023:8023 -p 8024:8024 -p 8025:8025 -p 8026:8026 puzzle-arcade-server

Connecting to the Server

Local Development

Via Telnet:

telnet localhost 8023

Via Netcat (TCP):

nc localhost 8024

Via WebSocket:

ws://localhost:8025/ws
ws://localhost:8026/ws

Game Menu

When you connect, you'll see the main menu:

==================================================
       WELCOME TO THE PUZZLE ARCADE!
==================================================

CLASSIC LOGIC PUZZLES:
  1) Sudoku          - Classic logic puzzle - fill 9x9 grid with digits 1-9
  2) KenKen          - Arithmetic cage puzzle - combine math and logic
  3) Kakuro          - Crossword math puzzle - fill runs with unique digits that sum to clues
  4) Binary Puzzle   - Fill grid with 0s and 1s - no three in a row, equal counts
  5) Futoshiki       - Inequality number puzzle - fill grid with constraints
  6) Nonogram        - Picture logic puzzle - reveal image from number clues
  7) Logic Grid      - Deductive reasoning puzzle - match attributes using logic

ADVANCED CP-SAT PUZZLES:
  8) Killer Sudoku   - Sudoku + Kakuro - regions must sum to targets
  9) Lights Out      - Toggle lights to turn all off - XOR constraint puzzle
 10) Mastermind      - Code-breaking with logical deduction and feedback
 11) Slitherlink     - Draw a single loop - numbers show edge counts

OPTIMIZATION CHALLENGES:
 12) Knapsack        - Maximize value within capacity constraints
 13) Task Scheduler  - Minimize makespan with dependencies and resources

ADVANCED REASONING PUZZLES:
 14) Nurikabe        - Island and sea puzzle - connectivity constraints
 15) Einstein's Puzzle - Who owns the fish? Multi-attribute deduction
 16) Minesweeper     - Find all mines using logical deduction

Commands:
  <number>  - Select game by number
  <name>    - Select game by name (e.g., 'sudoku')
  help      - Show this menu again
  quit      - Exit the server
==================================================

Universal Game Commands

All games support these commands:

Starting and Managing Games

• <number> [difficulty] - Select game by number (e.g., 1 medium)
• <name> [difficulty] - Select game by name (e.g., sudoku hard)
• show - Display the current grid
• help - Show game-specific commands and rules
• menu - Return to main menu
• quit - Exit the server

Playing Games

• place <row> <col> <value> - Place a number/value on the grid
  • Example: place 1 5 7 (places 7 at row 1, column 5)
• clear <row> <col> - Clear a cell you've filled
• hint - Get a hint for the next move
• check - Check your progress
• solve - Show the solution (ends current game)

Special Commands (Game-Specific)

• Logic Grid: connect and exclude commands for associations
• See in-game help for game-specific commands

Example Gameplay Sessions

Sudoku

> sudoku medium

==================================================
SUDOKU - MEDIUM MODE
==================================================
Fill the grid so that every row, column, and 3x3 box
contains the digits 1-9 without repetition.

Type 'help' for commands or 'hint' for a clue.
==================================================

  | 1 2 3 | 4 5 6 | 7 8 9 |
  -------------------------
1 | . . 3 | . 2 . | 6 . . |
2 | 9 . . | 3 . 5 | . . 1 |
3 | . . 1 | 8 . 6 | 4 . . |
  -------------------------
4 | . . 8 | 1 . 2 | 9 . . |
5 | 7 . . | . . . | . . 8 |
6 | . . 6 | 7 . 8 | 2 . . |
  -------------------------
7 | . . 2 | 6 . 9 | 5 . . |
8 | 8 . . | 2 . 3 | . . 9 |
9 | . . 5 | . 1 . | 3 . . |
  -------------------------
Moves made: 0
==================================================

> hint
Hint: Try placing 4 at row 1, column 1

> place 1 1 4
Number placed successfully!

> check
Puzzle not yet complete. Keep going!
Moves made: 1

KenKen

> kenken easy

==================================================
KENKEN - EASY MODE
==================================================
KENKEN RULES:
- Fill 4x4 grid with 1-4
- No repeats in rows or columns
- Satisfy cage arithmetic constraints
- Operations: + - * /
==================================================

  | 1  | 2  | 3  | 4  |
  +----+----+----+----+
1 | .8+| .  | .3 | .2 |
  +----+----+----+----+
2 | .  | .6+| .  | .3-|
  +----+----+----+----+
3 | .2 | .6+| .8+| .  |
  +----+----+----+----+
4 | .  | .  | .  | .  |
  +----+----+----+----+

Cages:
  8+: (1,1), (1,2), (2,1)
  3: (1,3)
  2: (1,4)
  ...

> place 1 3 3
Number placed successfully!

Architecture

This server is built on the chuk-protocol-server framework, which provides:

• Multiple transport protocol support (Telnet, TCP, WebSocket, WS-Telnet)
• Telnet protocol negotiation (IAC, WILL, WONT, DO, DONT)
• WebSocket handling with ping/pong keepalive
• Connection management and monitoring
• Asynchronous I/O with Python asyncio

Game Architecture

All games extend the PuzzleGame abstract base class:

class PuzzleGame(ABC):
    @property
    @abstractmethod
    def name(self) -> str: ...

    @property
    @abstractmethod
    def description(self) -> str: ...

    @abstractmethod
    def generate_puzzle(self) -> None: ...

    @abstractmethod
    def validate_move(self, *args) -> tuple[bool, str]: ...

    @abstractmethod
    def is_complete(self) -> bool: ...

    @abstractmethod
    def render_grid(self) -> str: ...

    def get_hint(self) -> tuple[Any, str] | None: ...
    def get_rules(self) -> str: ...
    def get_commands(self) -> str: ...

Handler Architecture

The ArcadeHandler class manages:

• Menu-driven game selection
• Command parsing and routing
• Grid display with proper formatting
• Game state management per connection
• Multi-game support

Development

Setup Development Environment

# Clone the repository
git clone https://github.com/chrishayuk/puzzle-arcade-server.git
cd puzzle-arcade-server

# Install development dependencies (with UV)
make dev-install

# Or with pip
pip install -e ".[dev]"

Testing

The project has comprehensive test coverage (95%, 450 tests):

# Run all tests
make test

# Run tests with coverage report
make test-cov

# Run tests in watch mode
make test-watch

# View coverage report in browser
make serve-coverage

Coverage by File

src/puzzle_arcade_server/base/puzzle_game.py       92%
src/puzzle_arcade_server/models/base.py           100%  ✨
src/puzzle_arcade_server/models/config.py         100%
src/puzzle_arcade_server/models/enums.py          100%
src/puzzle_arcade_server/models/games.py          100%
src/puzzle_arcade_server/games/__init__.py        100%
src/puzzle_arcade_server/games/lights_out.py      100%
src/puzzle_arcade_server/games/scheduler.py       100%  ✨
src/puzzle_arcade_server/games/binary.py           98%
src/puzzle_arcade_server/games/einstein.py         98%
src/puzzle_arcade_server/games/knapsack.py         98%
src/puzzle_arcade_server/games/mastermind.py       98%
src/puzzle_arcade_server/games/futoshiki.py        98%
src/puzzle_arcade_server/games/slitherlink.py      98%
src/puzzle_arcade_server/games/kakuro.py           95%
src/puzzle_arcade_server/games/nonogram.py         93%
src/puzzle_arcade_server/games/minesweeper.py      92%
src/puzzle_arcade_server/games/sudoku.py           92%
src/puzzle_arcade_server/games/nurikabe.py         92%
src/puzzle_arcade_server/games/kenken.py           91%
src/puzzle_arcade_server/games/logic_grid.py       91%
src/puzzle_arcade_server/games/killer_sudoku.py    90%
------------------------------------------------------
TOTAL                                               95%  🎯

All files now meet the 90%+ coverage threshold! ✅

Code Quality

The project follows modern Python best practices with a 9.8/10 compliance score:

Tooling

• Ruff: Fast linter and formatter (replaces black + flake8)
• MyPy: Static type checking
• Pytest: Testing framework with async support
• Bandit: Security vulnerability scanning

Code Standards

• ✅ Pydantic v2 Native (10/10) - All models use ConfigDict, zero deprecation warnings
• ✅ Async Native (9.5/10) - All I/O operations use async/await properly
• ✅ Type-Safe (10/10) - No dict["key"] patterns, only typed Pydantic models
• ✅ No Magic Strings (10/10) - All constants use enums or typed constants
• ✅ Test Coverage (10/10) - 95% overall, all files ≥90%

Quality Metrics

• 450 tests - All passing ✅
• 95% coverage - Exceeds 90% threshold ✅
• Zero linting errors - Clean codebase ✅
• Full type safety - MyPy passes ✅
• 2,852 statements - Well-tested and documented

# Run all checks (lint + typecheck + test + security)
make check

# Run linter
make lint

# Format code
make format

# Type checking
make typecheck

# Security scanning
make security

Running Example Clients

# Telnet client examples
make example-telnet              # Browse all games
make example-telnet-sudoku       # Sudoku demo
make example-telnet-kenken       # KenKen demo
make example-telnet-interactive  # Interactive mode

# WebSocket client examples
make example-ws                  # Tour all games
make example-ws-sudoku           # Sudoku demo
make example-ws-binary           # Binary puzzle demo
make example-ws-solve            # Solve with hints
make example-ws-interactive      # Interactive mode

CI/CD

The project includes GitHub Actions workflows:

• test.yml: Runs tests on Ubuntu, Windows, macOS with Python 3.11, 3.12, 3.13
• publish.yml: Publishes to PyPI on release
• release.yml: Creates GitHub releases
• fly-deploy.yml: Auto-deploys to Fly.io on main branch push

Coverage threshold is set to 90% - builds fail if coverage drops below this.

Deployment to Fly.io

Using Make (Recommended)

# Deploy to Fly.io
make fly-deploy

# Check status
make fly-status

# View logs
make fly-logs

Manual Deployment

1. Install the Fly CLI: https://fly.io/docs/hands-on/install-flyctl/

2. Login to Fly:

fly auth login

3. Create and deploy the app:

# First deployment (creates the app)
fly launch --config fly.toml --now

# Subsequent deployments
fly deploy

4. Important: Allocate a public IPv6 address for TCP services:

# Allocate IPv6 (free)
fly ips allocate-v6

# Verify IP is allocated
fly ips list

5. Check the status:

fly status

6. View logs:

fly logs

7. Connect to your Puzzle Arcade server:

# Get your app's IPv6 address
fly ips list

# Connect via telnet using IPv6 (free tier)
telnet <your-ipv6> 8023

# WebSocket connections work with hostname
# ws://<your-app>.fly.dev:8025/ws

Note: TCP services (Telnet, raw TCP) require a public IP address on Fly.io. We use IPv6 which is free. IPv4 costs $2/month and is not needed for most users.

Project Structure

puzzle-arcade-server/
├── src/
│   └── puzzle_arcade_server/
│       ├── __init__.py           # Package initialization
│       ├── server.py             # Main arcade handler (354 lines)
│       ├── base/
│       │   ├── __init__.py       # Base package
│       │   └── puzzle_game.py    # Abstract base class (35 lines)
│       ├── games/
│       │   ├── __init__.py       # Game registry (AVAILABLE_GAMES)
│       │   ├── sudoku.py         # Sudoku (9×9, 121 lines, 92% coverage)
│       │   ├── kenken.py         # KenKen (4×4-6×6, 216 lines, 91% coverage)
│       │   ├── kakuro.py         # Kakuro (5×5-8×8, 134 lines, 95% coverage)
│       │   ├── binary.py         # Binary (6×6-10×10, 154 lines, 99% coverage)
│       │   ├── futoshiki.py      # Futoshiki (4×4-6×6, 160 lines, 98% coverage)
│       │   ├── nonogram.py       # Nonogram (5×5-10×10, 116 lines, 93% coverage)
│       │   ├── logic_grid.py     # Logic Grid (117 lines, 90% coverage)
│       │   ├── killer_sudoku.py  # Killer Sudoku (9×9, 404 lines, 93% coverage)
│       │   ├── lights_out.py     # Lights Out (5×5-7×7, 204 lines, 94% coverage)
│       │   ├── mastermind.py     # Mastermind (4-6 pegs, 258 lines, 92% coverage)
│       │   ├── slitherlink.py    # Slitherlink (5×5-10×10, 343 lines, 91% coverage)
│       │   ├── knapsack.py       # Knapsack (5-12 items, 267 lines)
│       │   ├── scheduler.py      # Task Scheduler (4-8 tasks, 381 lines)
│       │   ├── nurikabe.py       # Nurikabe (6×6-10×10, 383 lines)
│       │   ├── einstein.py       # Einstein's Puzzle (5 houses, 290 lines)
│       │   └── minesweeper.py    # Minesweeper (6×6-10×10, 293 lines)
│       └── utils/
│           └── __init__.py       # Utility functions
├── tests/
│   ├── test_puzzle_game.py       # Base class tests (4 tests)
│   ├── test_sudoku_game.py       # Sudoku tests (11 tests)
│   ├── test_kenken_game.py       # KenKen tests (25 tests)
│   ├── test_kakuro_game.py       # Kakuro tests (12 tests)
│   ├── test_binary_game.py       # Binary tests (27 tests)
│   ├── test_futoshiki_game.py    # Futoshiki tests (25 tests)
│   ├── test_nonogram_game.py     # Nonogram tests (12 tests)
│   ├── test_logic_grid_game.py   # Logic Grid tests (13 tests)
│   ├── test_killer_sudoku.py     # Killer Sudoku tests (27 tests)
│   ├── test_lights_out.py        # Lights Out tests (23 tests)
│   ├── test_mastermind.py        # Mastermind tests (31 tests)
│   ├── test_slitherlink.py       # Slitherlink tests (33 tests)
│   ├── test_knapsack.py          # Knapsack tests (30+ tests)
│   ├── test_scheduler.py         # Scheduler tests (35+ tests)
│   ├── test_nurikabe.py          # Nurikabe tests (40+ tests)
│   ├── test_einstein.py          # Einstein's Puzzle tests (35+ tests)
│   └── test_minesweeper.py       # Minesweeper tests (40+ tests)
├── examples/
│   ├── simple_client.py          # Telnet client example
│   ├── websocket_client.py       # WebSocket client example
│   └── README.md                 # Example usage guide
├── .github/
│   └── workflows/
│       ├── test.yml              # Multi-platform CI testing
│       ├── publish.yml           # PyPI publishing
│       ├── release.yml           # GitHub releases
│       └── fly-deploy.yml        # Fly.io deployment
├── pyproject.toml                # Modern Python project config
├── config.yaml                   # Multi-transport server configuration
├── Dockerfile                    # Docker build instructions
├── fly.toml                      # Fly.io deployment config
├── Makefile                      # Development commands (50+ targets)
├── MANIFEST.in                   # Package distribution files
└── README.md                     # This file

Key Statistics

• Total Lines of Code: 2,852 statements in src/
• Test Coverage: 95% overall (450 tests, all passing)
• Code Quality Score: 9.8/10 (near perfect compliance)
• Games Implemented: 16 complete puzzle types
  • 7 Classic Logic Puzzles
  • 4 Advanced CP-SAT Puzzles
  • 2 Optimization Challenges
  • 3 Advanced Reasoning Puzzles
• Supported Transports: 4 (Telnet, TCP, WebSocket, WS-Telnet)
• Make Targets: 50+ development commands
• All Files: ≥90% test coverage ✅

Use Cases

1. LLM Reasoning Demonstration

Perfect for demonstrating LLM reasoning capabilities:

1. LLM connects via telnet: telnet localhost 8023
2. Selects a puzzle: sudoku hard
3. Receives puzzle in clean ASCII format
4. Analyzes constraints and generates solution
5. Submits moves: place 1 5 7
6. Server validates each move
7. Puzzle solved! Proof of reasoning capability

2. Constraint Solver Testing

Test the generality of constraint solvers (like MCP solvers):

• Different puzzle types → Same underlying solver
• Clean ASCII output → Easy for solver parsing
• Simple interface → Focus on solving, not UI
• Pure validation → Server validates, doesn't solve

3. Educational Tool

Learn about constraint satisfaction problems:

• 16 different puzzle types demonstrating various constraint types:
  • AllDifferent constraints (Sudoku, KenKen, Futoshiki)
  • Arithmetic constraints (KenKen, Kakuro, Killer Sudoku)
  • Boolean/SAT constraints (Lights Out, Binary Puzzle)
  • Loop/Edge constraints (Slitherlink)
  • Deduction constraints (Mastermind, Logic Grid, Einstein's Puzzle)
  • Optimization objectives (Knapsack, Task Scheduler)
  • Temporal reasoning (Task Scheduler)
  • Connectivity constraints (Nurikabe, Slitherlink)
  • Probabilistic reasoning (Minesweeper)
  • And more!
• Well-documented code showing puzzle generation algorithms
• Comprehensive tests (450 tests, 95% coverage) demonstrating validation
• Production-ready - 9.8/10 code quality score
• Type-safe - Full Pydantic v2 and MyPy compliance
• Clean architecture for adding new puzzles

Adding New Puzzle Games

1. Create a new game file in src/puzzle_arcade_server/games/:

from ..base.puzzle_game import PuzzleGame

class MyPuzzleGame(PuzzleGame):
    @property
    def name(self) -> str:
        return "My Puzzle"

    @property
    def description(self) -> str:
        return "A cool puzzle game"

    def generate_puzzle(self) -> None:
        # Generate puzzle with unique solution
        self.grid = [[0] * self.size for _ in range(self.size)]
        # ... your generation logic
        self.game_started = True

    def validate_move(self, row: int, col: int, num: int) -> tuple[bool, str]:
        # Validate and apply move
        if not self._is_valid(row, col, num):
            return False, "Invalid move!"
        self.grid[row][col] = num
        self.moves_made += 1
        return True, "Number placed successfully!"

    def is_complete(self) -> bool:
        # Check if puzzle is solved
        return all(cell != 0 for row in self.grid for cell in row)

    def render_grid(self) -> str:
        # Return ASCII art representation
        return "  | 1 | 2 | 3 |\n" + ...

    def get_rules(self) -> str:
        return "MY PUZZLE RULES:\n- Rule 1\n- Rule 2"

    def get_commands(self) -> str:
        return "MY PUZZLE COMMANDS:\n  place <row> <col> <num>"

2. Register it in src/puzzle_arcade_server/games/__init__.py:

from .my_puzzle import MyPuzzleGame

AVAILABLE_GAMES = {
    "sudoku": SudokuGame,
    "kenken": KenKenGame,
    # ... other games
    "mypuzzle": MyPuzzleGame,  # Add your game
}

3. Add tests in tests/test_my_puzzle_game.py:

from puzzle_arcade_server.games.my_puzzle import MyPuzzleGame

class TestMyPuzzleGame:
    def test_initialization(self):
        game = MyPuzzleGame("easy")
        assert game.name == "My Puzzle"

    def test_generate_puzzle(self):
        game = MyPuzzleGame("easy")
        game.generate_puzzle()
        assert game.game_started

    # ... more tests (aim for >90% coverage)

4. Run tests and verify:

make test-cov
make check

Contributing

Contributions are welcome! Please follow these guidelines:

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-puzzle)
3. Make your changes
4. Run tests and checks (make check)
5. Ensure coverage stays above 90% (make test-cov)
6. Commit your changes (git commit -m 'Add amazing puzzle')
7. Push to the branch (git push origin feature/amazing-puzzle)
8. Open a Pull Request

Development Guidelines

• Follow PEP 8 style guide (enforced by ruff)
• Add type hints to all functions
• Write tests for new features (>90% coverage)
• Update documentation as needed
• Ensure all grid headers align properly with rows

Troubleshooting

Server won't start

• Ensure chuk-protocol-server is installed: uv pip install chuk-protocol-server
• Check ports aren't already in use: lsof -i :8023,8024,8025,8026
• Verify Python version is 3.11+: python --version

Tests failing

• Install dev dependencies: make dev-install
• Clear cache: make clean
• Check Python version compatibility

Coverage too low

• Run coverage report: make test-cov
• View HTML report: make serve-coverage
• Add tests for uncovered code

Grid alignment issues

• All grid headers must align with row pipes
• Use the format " |" for headers to match row format "N |"
• Test visually: make example-telnet-kenken

License

MIT License - see the main chuk-protocol-server project for details.

Credits

• Built using the chuk-protocol-server framework
• Puzzle generation algorithms based on backtracking and constraint propagation
• Uses modern Python tooling: UV, Ruff, MyPy, Pytest

Links

• chuk-protocol-server - Multi-transport server framework
• sudoku-telnet-server - Original single-game implementation
• UV - Fast Python package manager
• Ruff - Fast Python linter and formatter
• Fly.io - Cloud deployment platform

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Ready to test your solver? Connect now and start solving! 🎮