Reliable and unreliable delivery
Send game traffic with reliable ordered, unreliable, or sequenced unreliable delivery. The relay preserves your networking stack’s payload format.
Relay multiplayer game traffic on your own infrastructure
Blitz Relay is a self-hosted UDP relay with Unity transports for Netcode for GameObjects, Fish-Networking, and Mirror.
How Blitz Relay fits into your game
Section titled “How Blitz Relay fits into your game”Your game host and clients connect to the relay over UDP. Players join with an eight-character room code, and the relay forwards traffic between the host and its clients. The game host does not need a public address or port forwarding.
Use Netcode for GameObjects, Fish-Networking, Mirror, or your own networking stack to run the game. Blitz Relay handles relay connections and room routing. Your game host runs the simulation and manages game state.
Ephemeral and persistent rooms
Create a room for a single session or use a persistent room to keep its code when the host changes.
Unity transport packages
Connect Netcode for GameObjects, Fish-Networking, or Mirror through the provided transports. You do not need to implement the relay protocol.
Open source and self-hosted
Run the .NET relay on your own infrastructure. No hosted relay service is required.
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-NetworkingInstall the Fish-Networking transport, create a room, and connect clients.
MirrorInstall the Mirror transport, create a room, and connect clients.
To get started, run the relay and configure a Unity transport. Then test a host-and-client session before deploying the relay to a remote server.
For an explanation of connections, room codes, and hosting, see How the relay works. If you use another networking stack, build a transport with the protocol library and UDP protocol reference.
Monitor and manage relays
Section titled “Monitor and manage relays”Blitz Relay Dashboard provides a browser interface for relay health, room listings, metadata edits, and client moderation. Save connections to multiple relays and switch between them without changing the dashboard deployment.
Blitz Relay DashboardRun the dashboard, connect to a relay, and manage rooms from your browser.