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Ten lines. Make something fun.

RGC Build Season, round one. Make something fun in ten lines, then post it on Xiaohongshu, Bilibili, or Douyin. Every week, three go on the homepage with your name on them.

Round one · November 1–30, 2026

Start with ten linesHow it works

Three steps to get it out there

No setup. One fun idea and ten lines are enough to begin.

  1. Write ten lines

    Open the Playground and remix an example. If it runs, it counts.

    Open the Playground →

  2. Make a poster

    Hit Share to get a poster of your work. Post it with the link in your first line, and anyone can open it to see the code and sign in to run it.

    Open this example →

  3. Post it

    Post a note on Xiaohongshu, a video or update on Bilibili, or a photo post on Douyin with #RGCBuildSeason, then share your link on the forum.

    Say hi on the forum →

Not sure what to make? Start with one of these

Each one already runs. Open it, change a few lines, and make it yours.

It might printTonight: Ramen

Pick dinner

Let randomness decide.

Start with this →It might printyour code really shines

Compliment machine

A small program that is on your side.

Start with this →It might printThe moon tonight / remembered you for me

Three-line poem

Two random lines that fit the mood.

Start with this →It might printFriday Dreams

Band name

Name the band you have not started yet.

Start with this →It might printYour lucky color: Mist blue

Lucky color

A color for the week. No questions asked.

Start with this →It might printWhat if a program could...

Your weird idea

The thing nobody else thought of is yours.

Start blank →

Post it, or nobody sees it

Three platforms, three ways to tell it. Pick the one you use, copy the text, and post.

XiaohongshuPost a note like this

I fixed my decision fatigue with ten lines of code

Every day I spend ten minutes deciding what to eat. So I wrote a program to decide for me. One tap, one random answer. Decision fatigue: solved. It is written in RGC. Open the link to see the code, sign in to run it. What should yours decide for you? Tell me in the comments. #RGCBuildSeason #RGC #LearnToCode #Python #IndieDev

  • Use the share poster as the first image and the output as the second.
  • Say what it does in the title. That gets more clicks than the tech stack.
  • Put the link in the first line so people can open it right away.
BilibiliPost a video like this

Ten lines of code fixed my decision fatigue

Cover: the output + “Ten lines of RGC” Description: My RGC Build Season entry. Ten lines that pick my meals. Open the link to see the code and sign in to run it. Topics: #RGCBuildSeason #RGC Tags: RGC, programming, Python, indie dev, ten lines of code

  • Show the result in the first three seconds, then explain how it works.
  • Put the run on screen before the code.
  • Pin the project link in the top comment.
DouyinPost a photo post like this

Ten lines of code fixed my decision fatigue

First image: the output. Second image: the share poster. Caption: I wrote a program in RGC that picks my meals. Open it to see the code, sign in to run it. #RGCBuildSeason #RGC #LearnToCode #Python

  • Put the output first and the poster second.
  • Show the result in the first three seconds, then explain how it works.
  • Pin the project link in the top comment.

Every week, we put good work in front

No lottery. The work does the talking, and real developers will see it.

Weekly picks

Every week we choose three projects for the homepage and community, with your name on them.

Official collection

At the end of round one, the best ideas go into one collection.

Creation story

The most-loved makers get an invitation to write about how they built it on the RGC blog.

What we look for

  • FunIt has an idea people want to click.
  • Ten linesTen lines or fewer is ideal. Longer is fine — make it first.
  • It runsThe link opens to the code, and it runs after signing in.

Questions you might have

Do I need to know RGC?

No. If you know Python, you can read it. Start from a Playground example and change it.

Does it have to be ten lines?

Ten lines is the challenge. Longer entries are welcome too. Make the thing first.

Do I need a GitHub account?

You can write, make a poster, and share a link without one. Running your program requires signing in with GitHub.

Can I post somewhere else?

Yes. The Xiaohongshu, Bilibili, and Douyin templates are ready to copy. Anywhere else, use #RGCBuildSeason.

Are there prizes?

Round one is about visibility: weekly features, your name on the site, and an official collection. No cash prizes, but real developers will see your work.

How will I know if I was featured?

We announce the weekly picks on the RGC community and blog every Friday, and tag you in the post.

Ten lines is enough.

Write it now. Post it today.

Make something fun

Use #RGCBuildSeason so we can find you.