Do I need a server for LAN multiplayer?

No — on a local network, devices can discover each other directly. That is what zero-config LAN discovery does: no cloud server, no hosting, no accounts.

Is UDP reliable enough for games?

UDP itself does not retransmit, so games that need guaranteed delivery add their own acknowledgements for important messages — and let per-frame updates flow unreliably. The tool handles messaging; your game logic decides what must be guaranteed.

Tutorial

Unity Multiplayer with UDP: LAN Games Without Servers

Not every multiplayer game needs the internet. Party games, VR arcades, classrooms, and playtests all happen on local networks — where UDP gives you the lowest latency and zero hosting costs. Here's how it works.

Why UDP for real-time games

TCP guarantees delivery but waits and retries — great for files, terrible for a player position that's already outdated. UDP fires packets and moves on: lower latency, no head-of-line blocking, and if one position update is lost, the next one arrives milliseconds later anyway. That's why virtually all real-time games use UDP under the hood.

The two hard problems in LAN multiplayer

Discovery. How do devices find each other without typing IP addresses? The answer is broadcast discovery — devices announce themselves on the local network and listen for others. Building this reliably across PC, mobile, and headsets is fiddly work.
Messaging. Once connected, you need fast, simple send/receive for positions, inputs, and game events — without dragging in a heavyweight networking framework.

Zero-config LAN with UDP Networking Pro

UDP Networking Pro solves both: devices on the same network discover each other automatically — no IP entry, no hosted server, no accounts — and exchange low-latency UDP messages across VR, PC, and mobile. It's built for exactly the sessions that don't need the internet: co-located VR, party games, demos, and classroom setups.

LAN multiplayer without servers

UDP Networking Pro — zero-configuration device discovery and low-latency UDP messaging for VR, PC, and mobile. $12.99 direct.

Get UDP Networking Pro — $12.99

Or see full details · Also on the Unity Asset Store ($13.99)

When LAN UDP is (and isn't) the answer

LAN UDP is perfect when players share a network: arcades, parties, offices, playtests. If your players are across the internet, you'll need relay servers or a hosted backend instead. But for the huge category of "people in the same room," nothing beats the simplicity — no server bills, no accounts, no latency to a distant data center.

UDP vs TCP for Unity LAN games

Real-time games care about latency more than guaranteed delivery: a late position update is useless, while a dropped one is replaced by the next frame's update. TCP's handshakes and retransmission delays buy reliability at the cost of exactly that latency.

UDP skips the handshake. Packets go out immediately, which is why it fits fast local play — and why games that need guaranteed delivery add their own acknowledgements for important messages only, instead of paying TCP's cost on everything.