Land Capture (VibeJam 2026 Entry)

Technical Details

This is a three.js based single / multiplayer action game. While usually I develop on Unity or Godot, this Jam competition rules had loading screens completely forbidden, which means not a lot of assets or mainstream game engines that port to web.

The competition also required minimum of 90% of the game done using AI.

I used Claude Code with my own basic harness. All assets were generated in code. music generated by me using Suno AI.

• Client Rendering: Three.js (via importmap from CDN — no bundler)
• Client logic: Vanilla ES modules (no React, no framework)
• Multiplayer: Colyseus 0.16 (WebSocket + Schema 3.x state sync)
• Game server: Node 20 + Express (static + REST) + tsx for TS dev
• Simulation: Pure JS module (prototype/sim/), copied atbuild time into server/src/sim/ so client and server share the exact same code
• Build / monorepo: pnpm v10 workspaces (no bundler — prototype is shipped as-is)
• Tests: Vitest

How to play

Controls

• Move with WASD / arrow keys or steer with the mouse
• Mouse wheel to zoom
• Tab for the leaderboard

The Basics

• Leave your home territory to draw a colored trail behind you
• Close the loop back onto your own color to capture the enclosed land
• If anyone crosses your trail, you die
• Standing on enemy land without a trail also kills you
• Die → respawn 3 seconds later in your team’s territory with a 5-second invulnerability shield

Score

• +1 per cell captured, +50 per claim, +500 per kill
• −4% on death
• 1.25× multiplier while your faction is Endangered (under 10% land)
• Team bonus at round end: 1st place gets +20%, 2nd +10%, 3rd +5%

Round Flow

• 15 minutes per round, then 30 seconds intermission, then a fresh round auto-starts
• Eliminated factions get reassigned to surviving teams
• The team holding the most land at time-zero wins

Top player icons appear above your name in real time:

⚔️ Top Killer · 🏆 Top Land Grabber · 🛡️ Top Survivor