Reliable and unreliable delivery
Relay game traffic over reliable ordered or unreliable channels without changing the payload produced by your networking stack.
Multiplayer relay infrastructure without the platform lock-in.
A self-hosted UDP relay for room-based multiplayer games, with transport packages for Netcode for GameObjects and Fish-Networking.
Put the relay between players, not your game and a platform
Section titled “Put the relay between players, not your game and a platform”Blitz Relay is an open-source UDP relay for host-driven multiplayer games. A host creates or claims a room, clients join with an eight-character code, and the relay forwards game traffic without requiring the host to expose an address or open an inbound port.
Ephemeral and persistent rooms
Create rooms for individual sessions or keep a room available across host changes with persistent rooms and host migration.
Unity transport packages
Use the provided transports with Netcode for GameObjects or Fish-Networking without implementing the relay protocol yourself.
Open source and self-hosted
Deploy the .NET relay on your own infrastructure with no dependency on a hosted relay platform.
Start with your networking stack
Section titled “Start with your networking stack”Netcode for GameObjectsInstall the NGO transport, create a room, and connect clients.
Fish-NetworkingConfigure the Fish-Networking transport and start relayed sessions.
Need the server first? Run Blitz Relay locally, then move on to your Unity transport. Building another integration? Start with the protocol library and wire protocol.