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Unity-Technologies/com.unity.multiplayer.docs
[ARCHIVED] Open Source documentation for Unity Multiplayer, which includes Netcode for GameObjects, the Unity Transport Package, Multiplayer Tools and Educational references and Sample Games such as Boss Room.
This is the archived open-source documentation site for Unity's multiplayer stack — Netcode for GameObjects, Unity Transport, Multiplayer Tools, and Multiplayer Play Mode. It's a Docusaurus site that Unity ran publicly for community contributions, now superseded by the official Unity Manual. If you're building multiplayer games with Unity, you should read the current docs at docs.unity3d.com, not this repo.
The Boss Room sample coverage is genuinely useful — architecture docs, action system breakdown, and optimization notes go deeper than most first-party game docs. The serialization section is thorough: it covers custom serializers, memcpy-safe types, fixed strings, and arrays as separate articles rather than dumping everything in one page. The testing section covers artificial network conditions and local multi-client setups, which is practical advice that's hard to find elsewhere. Version-pinned snapshots for MPPM (1.0.0 through 1.4.3) mean you can diff behavior across releases if you're stuck on an older Unity LTS.
It's archived — Unity themselves say to go elsewhere, so anything you find here may be stale or contradict the current package behavior. The repo is classified as JavaScript (it's a Docusaurus config), which will throw off anyone expecting C# content or code examples. Community contribution sections are thin: three YouTubers listed under 'community contributions' isn't a real ecosystem resource. There's no searchable API reference here — it's prose docs only, so it doesn't replace the package scripting reference you actually need when debugging.