Real AI agent use cases, with sources and setup prompts

Build an endless-runner clone from a two-word prompt

bluumik typed a two-word prompt into GPT-6 Astra and Claude Opus 5.5 to build a Subway Surfers-style game; one went clean and realistic, the other full graffiti with neon walls and coins.

$10 in / $50 out per 1M tokens30 minBeginnerSource linked

Source

@bluumik on X · 2026-10-20

Written in our own words. Credit to the original author. Link checked 2026-10-24.

What they did

bluumik typed a two-word prompt into GPT-6 Astra and Claude Opus 5.5 to build a Subway Surfers-style game; one went clean and realistic, the other full graffiti with neon walls and coins.

Result (as claimed)

Two playable runner prototypes to compare.

Tools they used

GPT-6 AstraClaude

Cost: GPT-6 Astra: from $10 in / $50 out per 1M tokens.

Set it up

  1. Write a one-page brief

    Describe the app in plain words: who it is for, the 3 core screens or actions, and what "done" looks like.

  2. Start the project with your agent

    Open GPT-6 Astra and paste the brief. Ask it to propose a stack and a file plan before writing code.

  3. Build one slice at a time

    Ship the smallest working flow first, run it, then add features one by one. Commit after each working step.

  4. Test it like a user

    Click through on desktop and phone. Ask the agent to add basic tests and fix anything that breaks.

  5. Check security and ship

    Keep keys in environment variables, check auth and database rules, then deploy and share the link.

Copy the full setup prompt

Paste into your agent and it will walk you through the setup, asking before anything that sends, posts or spends.

You are helping me set up this AI use case end to end in Claude Code.

Goal: Build an endless-runner clone from a two-word prompt
What the original author did: bluumik typed a two-word prompt into GPT-6 Astra and Claude Opus 5.5 to build a Subway Surfers-style game; one went clean and realistic, the other full graffiti with neon walls and coins.
Reported result (as claimed by the author): Two playable runner prototypes to compare.
Source: https://x.com/bluumik/status/2112608103632093680
Tools they used: GPT-6 Astra, Claude
Category: Vibe coding & apps

Please:
1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like).
2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure.
3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data.
4. Finish with a checklist to run it again next time.

The Daily 5

Get five new use cases tomorrow morning

Free. Real sources. Unsubscribe any time.

Guides for this use case

How to vibe code a game with AI

Related use cases