Fallout: New York

An adventure and RPG game Chris First built with Claude Opus 5.5. Copy the exact prompt free.

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by Chris First (@chrisfirst)FreeOpus 5.5 game prompts

@chrisfirst built this with Claude Opus 5.5 and shared the one-shot prompt on X; it is quoted below word for word. Fallout: New York, a full Fallout game you play in your browser, built with Claude Opus 5.5. Quests. Dialogue trees. V.A.T.S. A working Pip-Boy. Zero texture files. Zero sound files. Every building, weapon, face and sound is generated by code. The original post had 3.6M views.

The prompt

make me a Fallout game in New York

Prompt by Chris First (@chrisfirst), quoted word for word from the original post. Model as stated by the creator; your result will differ.

What’s inside

  1. Copy the prompt below, or download it as a SKILL.md
  2. Paste it into Claude Opus 5.5, ideally in Claude Code so it can write, run and test the game
  3. Swap in your own theme, characters or rules where the prompt names theirs
  4. Play it, then ask for fixes and polish in plain words

What you’ll bring

  • Claude Opus 5.5 (Claude Code, or a Claude chat for single-file HTML games)
  • A browser to play the result
  • Your own twist on the idea, if you want one

What you’ll get

  • A playable browser game in the spirit of the one above, written by Claude
  • The code, which you can keep editing

Perfect for

  • Anyone who wants to make a game without coding
  • Developers testing what Opus 5.5 can build
  • Teachers and parents making a game with kids

Also found as

opus 5.5 game prompt · claude game prompt · one shot game prompt · adventure & rpg · fallout: new york

Questions

What is Fallout: New York?

Fallout: New York is an adventure and RPG game that Chris First (@chrisfirst) built with Claude Opus 5.5. This page quotes the prompt they shared, word for word.

Who made it, and where was the prompt shared?

Chris First (@chrisfirst) made it and shared the prompt on X: https://x.com/chrisfirst/status/2104644598626934858. You can find more from them at https://x.com/chrisfirst.

How do I use the prompt?

1. Copy the prompt below, or download it as a SKILL.md. 2. Paste it into Claude Opus 5.5, ideally in Claude Code so it can write, run and test the game. 3. Swap in your own theme, characters or rules where the prompt names theirs. 4. Play it, then ask for fixes and polish in plain words.

Is it free?

Yes. Copying the prompt and downloading the SKILL.md costs nothing on Omo. You run it with your own access to Claude Opus 5.5.

The video and the prompt belong to Chris First. Omo lists them free, with credit and a link to the original post. Creators can ask us to remove a listing at omo.space/support.