Le Royaume des Pépins, is a browser game. A fruit kingdom gets invaded by germs and microbes. You play a watermelon that needs to purify the kingdom and take down the germs trying to destroy it. Runs in any browser and mobile as well.

**Where the idea came from**

My daughter (9) and her friend wrote this in a notebook over the summer's holidays:

"Once upon a time there was a little slice of watermelon who lived in a very happy town. He met a lemon who said, there's an army of germs coming! I suggest you go to the market that sells weapons, it's not very far."

THB I loved that pitch. Only kids can come up with these kind of ideas. I used their drawings as is, only did some cleanup and colored them with GPT and build the 3D with Meshy, so the characters kept their original shapes instead of drifting into generic AI fruit.

**How Claude helped**

Claude Code is the main coding agent I used. Concretely:

* I pasted their notebook page in close to verbatim instead of rewriting it into a proper design doc. 
* Claude wrote the gameplay code: enemy behaviour, the purify mechanic, collisions, animations, win and lose states, cins, etc.
* The loop was my daughter playing for thirty seconds, telling me what felt off, me describing it to Claude in plain language, rebuild. "The germs are too slow" became a tuning pass.

**Free to try**

Completely free, no payment and no account. Open the link in a browser and it plays: [https://sandscape.app/play?g=pDdi6wlB](https://sandscape.app/play?g=pDdi6wlB)

**Disclosure**

This was build with Sandscape, a platform I'm making with friends, which uses Claude Code as its coding agent alongside with other tools like Meshy and ElevenLabs.

Happy to answer anything about the process.

I built my 9 year old's game concept with Claude Code. She wrote the design doc in a notebook.