cheeseburger - you need to opt into the level editor beta in Properties --> Betas. Once you're playing the beta, you can open the editor and the screen to toggle packs with the M key.

how do you play levels from these packs? i have a bunch installed but see nowhere in the game to select.

tysm omg

These vanilla levels are the absolute best for real. Thank you so much. I like the more intricate ones and the challenges and stuff but vanilla mosa lina is peak