Real AI agent use cases, with sources and setup prompts

Clone SimCity 2000 as a low-poly WebGL game with Opus

Used Claude Opus 5.5 to rebuild SimCity 2000 logic as a TypeScript WebGL low-poly city builder over a few days.

$4 in / $20 out per 1M tokensa few daysAdvancedSource linked

Source

drdator on Hacker News · 2026-10-06 · Project link

Written in our own words. Credit to the original author. Link checked 2026-10-15.

What they did

Used Claude Opus 5.5 to rebuild SimCity 2000 logic as a TypeScript WebGL low-poly city builder over a few days.

Result (as claimed)

Playable clone started from a single detailed prompt plus original assets for inspection.

Tools they used

Claude Opus 5.5

Cost: Claude Opus 5.5: from $4 in / $20 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 Claude Opus 5.5 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: Clone SimCity 2000 as a low-poly WebGL game with Opus
What the original author did: Used Claude Opus 5.5 to rebuild SimCity 2000 logic as a TypeScript WebGL low-poly city builder over a few days.
Reported result (as claimed by the author): Playable clone started from a single detailed prompt plus original assets for inspection.
Source: https://news.ycombinator.com/item?id=49977886
Tools they used: Claude Opus 5.5
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.

Related use cases