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CursorCoding & Dev2026-10-14

Build a multiplayer 3D capture-the-flag browser game with Cursor and Gemini

Backyard Rascals gameplay still from @chongdashu's post

@chongdashu built a fully multiplayer capture-the-flag 3D game with cartoon animals using Cursor and Gemini 4 Argon, after skipping earlier Gemini releases for game work. The game, Backyard Rascals, is playable in the browser at backyard-rascals.vercel.app. Video of gameplay is in the post.

Try it yourself

What you get

A playable multiplayer browser CTF you can share, built inside Cursor.

Tools

  • Cursor
  • Gemini 4 Argon (as used by the author)
  • A host for the web build (author used Vercel)

Time / cost: Not stated

Steps

  1. Scaffold a 3D web game with multiplayer networking.
  2. Implement flag grab, tag/bonk and return-to-base win conditions.
  3. Playtest locally, then deploy a public URL.
  4. Invite others and fix the first wave of bugs.

Copy-ready prompt

Build a browser multiplayer 3D capture-the-flag game with simple cartoon animal characters. Needs: 3v3 teams, grab the flag, tag defenders, return to base to score. Deploy a playable web build. Keep art and controls readable on a laptop keyboard.

Prompt written by AgentPlays, based on @chongdashu’s post. Check the output yourself and approve before anything is sent or bought.

Watch out: Multiplayer netcode is hard; expect iteration. The live demo is the author's build, not ours.

Proof / source

Live demo Author's public X post (Oct 14, 2026) plus live demo at backyard-rascals.vercel.app.

In their words

I've been skipping Gemini releases for gamedev recently. They weren't the best. But Gemini 4 Argon is different. I built a fully MULTIPLAYER capture-the-flag 3D game with cartoon animals using Cursor. Play it: https://backyard-rascals.vercel.app

— @chongdashu on X

Read the original source ↗ Discussion ↗

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