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NetworkedInvaders

Multiplayer space invaders with client-server architecture. Technical test.

Development time: ~12 hours over 2 days

Context

Coding test demonstrating:

  • Client-server networking architecture
  • WebSocket real-time communication
  • Game state synchronization (timer, scoring, game reset)
  • Refactoring and code organization

Tech

// Client
Engine: Unity
Language: C#
Network: WebSocket (NativeWebSocket)

// Server
Runtime: Node.js
Protocol: WebSocket
State: Synchronized game instances

Features

Networking

  • WebSocket communication - switched from HTTP to WebSockets for real-time sync
  • Player authentication - login system with username handling and error management
  • Game state synchronization across clients
  • Player disconnection handling

Gameplay

  • Timer system synchronized between client/server with gameover on timeout
  • Scoring system with individual highscore tracking (server-side)
  • Game reset functionality - restart game after gameover
  • Invader formations - fixed edge collision bugs, refactored spawn system

Server Architecture

  • Multiple game instance management
  • Player session handling
  • Event-based communication (emitters/handlers)
  • Individual player scoring and tracking

Implementation Details

Client-Side (Unity)

  • Switched to new Unity Input System (PlayerControls.inputactions)
  • Newtonsoft.Json for serialization (replaced JsonUtility)
  • WebsocketHandler for network communication (NativeWebSocket library)
  • Namespaced existing code for better organization
  • Refactored managers (GameManager, NetworkRegistry, UIManager)
  • Fixed invader edge collision bug

Server-Side (Node.js)

  • Complete server rework for WebSocket protocol
  • Event-based architecture (emitters/handlers pattern)
  • Game instance management with player sessions
  • Individual player scoring and highscore tracking
  • Nodemon for development speed

Status

Completed technical test. Submitted for evaluation.

Running the Project

Server

cd server
npm install
npm start

Client

Open project in Unity and press Play. Server must be running on localhost.