They definitely seem to be somewhat hidden but so far nothing difficult, but nothing happens when you find them, you can't pick them up, you can whack them around the level though but that's too tedious to possibly be what you have to do. So does anyone know what they do? Google has nothing, maybe they were only added in the recent 360 version so there's no info online yet? Its kind of nagging me.

Also, anyone who's played it, what do you think? About 2 hours played and I'm still not sure how I feel about it, especially how it controls...