This repo is a Super Mario Odyssey custom kingdom. The mod's main download is on Gamebanana, but prereleases and extra assets can be found in the github repo instead. Contains 1 star, 10 green stars in the main kingdom, and 2 green stars in each of the six sub areas, adding up to 23 stars to collect!
The same as any other switch mod installation, place the romfs folder of the mod download in this directory on your SD card: /atmosphere/contents/0100000000010000/romfs
If you don't have your switch modded, this won't work. The discord server won't help you mod your switch, please look elsewhere for this information. If it still doesn't work, join the discord and people can help! https://discord.gg/EnaKHEg