Feel free to join in! (This is IMO)
File:Insane.png First cube section (Triple spikes and insidiousness)
File:Easy.png First ball section (Introduction = basic)
File:Harder.png Ship section (It's a heck hole unless you know the trick)
File:Auto.png Final cube section (Self-explanatory, really)
File:Hard.png Final ball section (This part's not THAT bad.)