Sphere Duel Game by Jakub "BeesQ" Łotysz

About

Sphere Duel is a 2D Online Multiplayer (Peer-To-Peer*) Top-Down Shooter, made as a Portfolio Project

*In the Gaming Industry, "Peer-To-Peer" typically refers to a Host-Client (Listen Server) model — one player acts as both Server and Client. This differs from true P2P, where all peers are equal with no central authority.

Features

• Online multiplayer for 2 players (Host-Client)
• Server-authoritative scoring and hit detection
• Health, death, and respawn system with visual feedback
• Round-based matches with win/lose screen
• Play Again and Main Menu options after match ends
• Disconnect handling with automatic return to menu
• Dynamic arena bounds based on camera size

Technologies

• Unity 6000.3.10f1
• Netcode for GameObjects 2.9.2
• Unity Transport 2.6.0
• Input System 1.18.0
• Multiplayer Play Mode 2.0.1
• Multiplayer Tools 2.2.8

Architecture

• Event-Driven Architecture — decoupled communication between systems via static GameEvents class (e.g. OnPlayerDied, OnScoreChanged, OnMatchWon)
• Server-Authoritative Design — health, scoring, projectile spawning and hit detection are all validated on the server to prevent cheating
• NetworkVariables — real-time state synchronization for health and scores across all clients
• RPCs — client-server communication for gameplay actions
  • ServerRpc — client-to-server requests (e.g. shooting)
  • ClientRpc — server-to-client broadcasts (e.g. death, respawn, match results)
• Singleton Pattern — centralized access points for GameManager, ScoreManager, and DisconnectHandler
• Centralized Constants — all magic numbers stored in Const.cs, with GameManager exposing Inspector-configurable overrides
• Separation of Concerns — utility classes like SpawnHelper keep logic clean and reusable

How to Play

Action	Control
Move	WASD
Aim	Mouse
Shoot	Left Click

First to 3 kills wins the match.

How to Run

1. Clone the repository
2. Open in Unity 6000.3.10f1
3. It is recommended to open MenuScene as the starting scene (an Editor script auto-redirects to MenuScene when entering Play Mode from other scenes)

Testing Multiplayer:

• Multiplayer Play Mode (MPPM) — enable via Window > Multiplayer Play Mode, add a Virtual Player, then enter Play Mode. One instance hosts, the other joins on 127.0.0.1 (localhost)
• Two Builds — build the project, run two instances. Host on one, join on the other using the host's local IP
• Default port: 7777

Project Structure (Key Folders)

Assets/
├── Editor/            ForceMenuSceneEditor
├── Prefabs/           Player, Projectile
│   └── UI/
├── Scenes/            GameScene, MenuScene
└── Scripts/
    ├── Core/          Const, GameEvents, GameManager, ScoreManager, SpawnHelper
    ├── Network/       ClientNetworkTransform, DisconnectHandler, NetworkManagerUI
    ├── Player/        PlayerController, PlayerHealth, PlayerShooting
    ├── Projectile/    Projectile
    └── UI/            HealthBarUI, WinScreenUI

Roadmap

• Unity Relay + WebGL — integrate Unity Relay to enable browser-playable builds hosted on itch.io or GitHub Pages, removing the need for port forwarding

Assets

• Graphics -> Kenney Game Assets (All-in-1)