This is a series of tutorial videos that explain each level individually, rather than all 30 levels at once in one long video. Click the link below to be taken to the full playlist of each video. I highly recommend that you start with Part 0, then you can watch any of the other parts.

https://www.youtube.com/playlist?list=PL1yQHzKCAwKPe73bl603xV-eJ8dRNgo1q