ASCII CRT roguelike

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

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by kriptoleidi (@kriptoleidi)FreeOpus 5.5 game prompts

@kriptoleidi built this with Claude Opus 5.5 and shared the full prompt on X; it is quoted below word for word. This prompt turns Opus 5.5 into a full-fledged dungeon crawler: a single HTML file that opens in your browser and is played using the keyboard. I ran it and played 10 times in a row. Each time, there was a new map and permanent death, with graphics made entirely of standard characters - just like on an 80s monitor. Here is the full prompt: Act as a lead game designer. Build a complete, turn-based ASCII roguelike in a single self-contained HTML/JS/CSS file with zero external dependencies. 1. Visual: 1980s CRT monitor, phosphor green text (#00FF66) on black, soft scanline glow. 2. Procedural The original post had 447 views.

The prompt

Act as a lead game designer. Build a complete, turn-based ASCII roguelike in a single self-contained HTML/JS/CSS file with zero external dependencies.
1. Visual: 1980s CRT monitor, phosphor green text (#00FF66) on black, soft scanline glow.
2. Procedural generation: 40x22 map, connected rooms and corridors.
3. Entities: @ hero, # wall, . floor, g goblin (5 HP), $ gold, > stairs down.
4. Mechanics: turn-based movement and combat, track HP and gold.
5. HUD: floor number, HP bar, combat log. Permadeath with restart.
Output only the working HTML code.

Prompt by kriptoleidi (@kriptoleidi), 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 · ascii crt roguelike

Questions

What is ASCII CRT roguelike?

ASCII CRT roguelike is an adventure and RPG game that kriptoleidi (@kriptoleidi) 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?

kriptoleidi (@kriptoleidi) made it and shared the prompt on X: https://x.com/kriptoleidi/status/2105246199653482872. You can find more from them at https://x.com/kriptoleidi.

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 kriptoleidi. 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.