BIY Mod - The Very Practical Mod

You can only feasibly install mods on the PC version of the game. This tutorial assumes you're on Steam for Windows.

Enabling content mods

1. Open Baba Is You and create a new levelpack.
2. Open the game's Local Data on Steam, then open the Data folder, then Worlds folder. 
3. At the top, you should see a folder named something like 109world.  This is the world folder.
4. If you open this folder, you should see folders for Sprites, Music, Palettes, etc.
5. In world_data.txt, add "mods=1" before the [levels] header. It should look like the other lines in the file

Installing the mod

1. Open the zip file for the mod. You should see a lua folder and a sprites folder.
2. Place the sprites folder inside the world folder, so that it merges with the Sprites folder that is already there.
3. Do the same as the previous, but for Sounds, if applicable.
4. Place the Lua folder inside the world folder too, so that it fits among the Music, Palettes, etc. folders.
5. Open the level editor and scroll to the very last page. Modded mechanics always show up at the end of the editor's object list!

If these instructions are unclear, let me know!