www.youtube.com/spatvark
The youtube user Spatvark has a walkthrough video for every single one of the bonus missions, and the story missions too. These have helped me immensely and I wanted to share them with you pie lovers out there!
Occaisionally though, I had to find my own way through a level, but these guides can help you plan your own approach and strategy to find a method you feel comfortable with.
The time and recording challenges can be done in separate run throughs, instead of going for them in one, making it a little less stressful!