This repository is a complete multiplayer co-op game sample called 'Boss Room', built by Unity Technologies to demonstrate best practices for using Unity Netcode for GameObjects (NGO). It implements a server-authoritative action RPG where up to 8 players cooperate to defeat a boss in a dungeon. The architecture is modular and state-driven: a connection state machine (Offline, ClientConnecting, Hosting, etc.) manages network lifecycle, while game flow states (MainMenu, CharSelect, BossRoom, PostGame) control scene transitions and gameplay logic. The core gameplay revolves around a ScriptableObject-based action system where abilities (melee, projectiles, buffs, stealth, etc.) are defined as data assets and executed via server-side action players with client-side anticipation for latency masking. The project integrates Unity Gaming Services for authentication, session management, and relay, and uses VContainer for dependency injection. Key entry points include ApplicationController (DI setup), ConnectionManager (network state machine), and GameStateBehaviour subclasses. Data flows involve client input sent via RPCs, server-side processing with NetworkVariables for state sync, and a typed NetworkedMessageChannel for decoupled event broadcasting. External dependencies include Unity Netcode, Unity Transport, Unity Gaming Services, VContainer, Cinemachine, and URP.