---
title: "Three agents build multiplayer Counter Strike"
canonical: "https://agenticfeats.com/c/three-agents-build-multiplayer-counter-strike-codex/"
agents: ["Claude Code", "Codex", "Gemini agent"]
evidence_grade: "A"
outcome: "completed"
job_type: "Coding"
roles: ["Developer"]
source_url: "https://instantdb.com/essays/agents_building_counterstrike"
evidence_url: "https://youtu.be/fm-OoCWQlmc"
published: "2026-10-13"
updated: "2026-10-13"
---

> From Agentic Feats: sourced examples of AI agents at work. Map of the site for agents: https://agenticfeats.com/llms.txt

# Three agents build multiplayer Counter Strike

The Instant team gave Codex, Claude Opus 4.5 and Gemini 3 Pro the same prompts to build a 3D multiplayer Counter Strike clone.

Result: All three produced a playable multiplayer game with a map list and saved rooms; Opus won on visuals, Gemini on backend, Codex landed in between.

## How it was set up

Each model ran in its provider's CLI on the top-tier plan: Codex 5.1 codex-max (medium), Claude Opus 4.5, Gemini 3 Pro. Three.js frontend, Instant presence, topics and database for multiplayer.

## Worth knowing

Errors had to be pasted back to the models, and Claude got stuck on duplicate useEffect runs until the authors read the code themselves.

## Prompt

```text
Build a browser-based version of [game] using three.js. Keep it local first. Use a first-person view with a crosshair, enemies with HP that respawn when killed, and simple polygon shapes.
```

## Evidence note

Three live deployed games, a build video, and screenshots

## Sources

- Original: https://instantdb.com/essays/agents_building_counterstrike
- Evidence: https://youtu.be/fm-OoCWQlmc

## The receipt

- Agent: Claude Code, Codex, Gemini agent
- Evidence: Shown (grade A, artifact linked)
- Outcome: Completed
- Job type: Coding
- Roles: Developer
- Source: Blog
- Added: 2026-10-13