Nokia Snake Game - Requirements Document

Project Overview

Project: Nokia Snake Game
Type: Greenfield web-based game
Development Approach: Extensible framework for future enhancements
Security: Security rules enforced (SECURITY baseline)

Intent Analysis Summary

• User Request: "Using AI-DLC develop me a Nokia Snake game"
• Request Type: New Project (game development)
• Scope Estimate: Single application with multiple features
• Complexity Estimate: Moderate (game logic, UI, extensible architecture)

Functional Requirements

FR-01: Platform and Technology

• Requirement: The game shall be web-based using HTML5, CSS, and JavaScript
• Rationale: User selected web-based platform for browser accessibility
• Acceptance Criteria: Game runs in modern web browsers without plugins

FR-02: Core Game Mechanics

• Requirement: The game shall implement full-featured Nokia Snake mechanics including:
  • Snake movement using arrow keys or WASD
  • Food collection and snake growth
  • Score tracking and display
  • Game over conditions (collision with self or walls)
  • Restart functionality
  • Multiple difficulty levels
  • Walls/obstacles
  • Speed increase as snake grows
  • Power-ups
  • Different food types
  • High score tracking
• Rationale: User selected "Full-featured" option (D)
• Acceptance Criteria: All listed features are implemented and functional

FR-03: Visual Design

• Requirement: The game shall use modern minimalist design
• Rationale: User selected modern minimalist over classic retro style
• Acceptance Criteria: Clean, simple, contemporary UI with good visual hierarchy

FR-04: Controls

• Requirement: The game shall support keyboard-only controls (arrow keys or WASD)
• Rationale: User selected keyboard-only input
• Acceptance Criteria: All game functions accessible via keyboard

FR-05: Game Modes

• Requirement: The game shall include single classic mode only
• Rationale: User selected single classic mode
• Acceptance Criteria: Classic snake gameplay mode is available

FR-06: Game State Management

• Requirement: The game shall maintain and display:
  • Current score
  • High score (persistent)
  • Game speed/level
  • Snake length
  • Game status (playing, paused, game over)
• Acceptance Criteria: All state information is accurately displayed and updated

FR-07: Game Loop

• Requirement: The game shall implement a smooth game loop with:
  • Consistent frame rate
  • Responsive controls
  • Collision detection
  • Food generation
  • Score calculation
• Acceptance Criteria: Game runs smoothly at consistent frame rate

Non-Functional Requirements

NFR-01: Performance

• Requirement: Simple implementation with no special performance requirements
• Rationale: User selected simple implementation
• Acceptance Criteria: Game runs without noticeable lag on modern hardware

NFR-02: Browser Compatibility

• Requirement: The game shall work on modern browsers (Chrome, Firefox, Safari, Edge)
• Acceptance Criteria: Game functions correctly on latest versions of major browsers

NFR-03: Responsive Design

• Requirement: The game shall be playable on different screen sizes
• Acceptance Criteria: Game scales appropriately for desktop screens

NFR-04: Code Quality

• Requirement: The codebase shall follow extensible framework patterns
• Rationale: User selected extensible framework for future enhancements
• Acceptance Criteria: Code is modular, well-documented, and follows separation of concerns

NFR-05: Security

• Requirement: All SECURITY baseline rules shall be enforced
• Rationale: User opted to enforce security rules
• Acceptance Criteria: Code complies with SECURITY-01 through SECURITY-15 where applicable

Technical Requirements

TR-01: Technology Stack

• Frontend: HTML5, CSS3, JavaScript (ES6+)
• No backend required: Game runs entirely in browser
• Storage: LocalStorage for high score persistence
• Build Tools: Optional (can use simple development server)

TR-02: Architecture

• Pattern: Modular JavaScript with separation of concerns
• Components: Game engine, rendering, input handling, state management
• Extensibility: Designed for easy addition of new features

TR-03: Development Standards

• Code Style: Consistent formatting and naming conventions
• Documentation: Inline code comments and README
• Testing: Basic functionality testing

User Scenarios

US-01: Starting the Game

1. User opens game in web browser
2. Game loads with main menu
3. User presses "Start Game" or similar
4. Game begins with snake in starting position

US-02: Playing the Game

1. User controls snake with arrow keys
2. Snake moves toward food
3. Snake grows when eating food
4. Score increases with each food item
5. Game continues until collision

US-03: Game Over and Restart

1. Snake collides with wall or itself
2. Game over screen displays final score
3. High score updates if beaten
4. User can restart game

US-04: Using Power-ups

1. Special power-up food appears
2. User collects power-up
3. Temporary effect activates (speed boost, invincibility, etc.)
4. Effect wears off after duration

Constraints and Assumptions

Constraints

• Web-only deployment (no mobile app, no desktop executable)
• Keyboard-only controls (no touch, no gamepad)
• Single game mode (classic only)
• Modern minimalist visual style (not retro pixel art)

Assumptions

• Users have modern web browsers
• Users understand classic Snake game mechanics
• No multiplayer functionality required
• No server-side components needed

Success Criteria

1. Game is fully playable in web browser
2. All core Snake mechanics are implemented
3. Modern minimalist UI is clean and functional
4. Codebase is extensible for future enhancements
5. Security baseline rules are followed
6. High scores persist between sessions

Open Questions and Future Considerations

1. Potential for additional game modes in future
2. Possible mobile adaptation with touch controls
3. Social features (score sharing, leaderboards)
4. Sound effects and music
5. Additional visual themes