Puzzle World Playground on iPad

I'm making a game using the puzzle world template for applying for the WWDC scholarship program, but the size is over the limit. So, I'm trying to make something from scratch, but can't figure out which modules to import for certain calls.


For example, world.Coordinates gives me an error saying "use of unresolved identifier 'world'". I already tried importing PlaygroundSupport, SpriteKit, Foundation, SceneKit, etc, but none of them worked. Can anyone help me figure out what libraries I need to import?