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Usef Farahmand
ActiveGame · Cross-platform

Mini Sumo

A cute 3D multiplayer sumo party game for 2–4 players: push your friends out of the ring. Runs in the browser, on Windows, macOS, Linux and Android, with an authoritative Colyseus server and an offline practice mode.

Oct 2026 – Present

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Overview

Problem

Party games work best when everyone understands them in five seconds, but most multiplayer games need accounts, installs or long waits for an opponent. I wanted a one-rule game (stay in the ring) that is fair online, playable on any device, and never leaves a player waiting for a match.

Solution

Built Mini Sumo as a monorepo with a React Three Fiber client and a Colyseus server that decides every push, ring-out and winner, so clients only send input. The same game session also runs inside the client, which gives a fully playable offline mode against bots when no server is reachable. Added quick match with bot fill-in after 30 seconds, private rooms with invite links, touch and keyboard controls, a wardrobe for hair, face and outfit, and a server-side virtual coin economy with arenas, an append-only ledger and a cosmetic shop. Releases for web, Windows, macOS, Linux and Android are built and published automatically with GitHub Actions.

Target Audience
Friends and families who want a quick, no-account party game on whatever device is at hand, and developers who want a readable open-source example of an authoritative multiplayer game.
My Role
Creator and Lead Developer — game design, 3D client, authoritative server and simulation, virtual economy, desktop and Android packaging, and CI/CD release pipeline.
Duration
< 1 mth

Team

Solo

Technologies

  • React
  • React Three Fiber
  • Three.js
  • TypeScript
  • Colyseus
  • Node.js
  • Vite
  • Electron
  • Capacitor
  • Multiplayer Networking
  • GitHub Actions

Feature Highlights

Fair authoritative multiplayer

The Colyseus server decides every push, ring-out and winner; clients only send input. Quick match and private rooms with invite links support 2–4 players.

Offline practice mode

The same game session runs locally in the app, so the game is fully playable against bots with no server and falls back automatically when the server is unreachable.

Wardrobe and Sumo Coins

Dress your wrestler with hair, face and outfit options, and earn or spend virtual coins across arenas. Looks never affect gameplay.

Play anywhere, released automatically

Web, Windows, macOS, Linux and Android builds with keyboard and touch controls, published as GitHub Releases by a CI pipeline.

Gallery

Lessons Learned

Keeping a single authoritative game session and reusing it on both the server and the client made offline mode almost free and kept every rule in one tested place. Building the economy server-side from the start, with idempotency keys and refunds, was far easier than retrofitting fairness later.

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