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28 · Games & play

Jetbrawl — a multiplayer jetpack arena in the browser

One simulation module is shared by the server, which is authoritative, and by every browser, which predicts: maps are rectangle primitives rasterised to tiles, and weapons, items and bots live in the same code, so an offline practice mode runs the identical game locally.

PeriodOct 2026StatusLiveAreaGames & playDomaintabspawn.com/play/jetbrawl

Highlights

  1. Client prediction for your own soldier and 100 ms interpolation for everyone else, over a WebSocket server written against RFC 6455 by hand with no npm packages.
  2. Six maps (Hangar, Canyon, Skyline, Highlands, Lagoon, Reactor) with parallax skies, a cached tile layer, procedural soldiers and touch sticks on phones.
  3. Crouching, shields, boost and damage pickups; the snapshot format carries their state, so server and client ship together.
  4. Runs as a hardened systemd service capped at 512 MB and a fraction of a CPU next to the rest of the portal.