Minecraft Paint Challenge?

I've seen a challenge in Minecraft on the internet where you can draw something and if it's good enough you can get it. Here is the video: And now I want to play the challenge too, but I don't know what it's called? And if the challenge is free, where can I get it?

The mod is called https://www.curseforge.com/...s/mc-paint. They don't get the items from the mod, but from the console.