300+ levels in boom blox - How and Where?

I seem to remember various reviews saying boom blox had over 300 levels or something. Well, Where are they? I've medaled in all the single player categories and have unlocked the expert levels, but there doesn't seem to be that many expert or pro levels to make up 300. And it still says I've only completed 10% of the game. What do you have to do to unlock everything else and get 100%?

Also, after you complete the expert challenges, then there are the super-expert challenges (I can't recall what the game calls them). Many times, you have to get silver or even gold to unlock the next segment of the game.

Also, I'll bet the multiplayers levels are counted into that 300 number. As far as I can remember, there are about 60 regular, 10 regular expert, 10 regular super-expert, 3x10x4 = 120 story mode levels, 30 expert story, 30 super-expert story levels. That's about 260 right there.