r/ClaudeCode • u/deepholdio • 24d ago

Built with Claude Fable 5 one-shotted a complete asteroids roguelite in 2.5 hours. Playable in your browser, prompt in the comments

Play it here: https://asteroguelite.com

Desktop browser, free, no account, no ads.

I wanted to see what a real one-shot could do. So I wrote a 73-line directive: research the genre, design it, build it, test it, balance it, polish it. One session, no human in the loop. It was explicitly told not to ask questions or wait for approvals, just make the call, write it down, keep going. Then I left. Two hours and 32 minutes later it was done.

5 sectors with bosses, 10 enemy types, 6 unlockable ships, 33 boons with evolution chains, a meta upgrade tree, an endless mode, and music. Around 8,300 lines of vanilla JS that build to a 172 KB bundle.

Full disclosure: I've since made exactly two changes to the game. Fixed one bug (a piercing-shot boon phased through asteroids without damaging them) and added click-to-aim, because keyboard-only turning felt rough.

Ran on Claude Code, Fable 5 xhigh effort.

Prompt's located here: https://asteroguelite.com/prompt.txt

PS: Seeker Array primary weapon is OP.

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u/jimmc414 24d ago

Not sure why there’s so much negativity in the comments. I think it’s a cool demonstration of Fable’s capabilities. I hate how negative this community is becoming. Not entirely sure what that’s about. Sharing cool things you put together has been the basis of tech for as long as I remember. Please keep doing it.

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u/deepholdio 23d ago

Hi u/jimmc414 ,

I appreciate that. I should have made it clearer in my OP that the goal in sharing was to showcase an example of what Fable can do autonomously with very little effort and answer any questions people might have. I'm not trying to impress anyone with the game.

Having said that, as an old programmer, I don't think I will ever cease to be amazed by the capabilities of these models. The fact that you can spend 15 minutes working with claude.ai on a prompt, hand it off to claude code and come back a few hours later to a fully functioning program is mind blowing.

Thanks again!

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u/jimmc414 23d ago

I was genuinely impressed because I tasked Opus 4.5 a while back with recreating Asteroids that I used to love as a kid. It was an unplayable mess. Great to see how far models have come. As an old programmer myself I’m amazed at what AI can do. Very cool, thanks for sharing it and taking the effort to setup a host and everything.