Little Big Planet, is in its truest form, a giant toybox.

I read that in the intro to the strategy guide written by one of the creators and I think that sums it up perfectly. The regular story levels are amazing and fun as hell to play; indeed some of them get very challenging and are very memorable.

The Metal Gear Solid 4 expansion was a lot of fun, I liked how the pulled off sneaking aspects, dodging searchlights like in MGS1.

Likewise, alot of the community developed levels are simply phenomenal and its truly a joy to see that this community of gamers is spending its time creating things for other gamers to enjoy, things truly from their own imagination, not just stuff heavily suggested in the main game. I heard the devs even say that some of the creators on the PSN have inspired them and showed them things they didn't even know they could do in the game.

I started building a level, but I understand it takes a tremendous amount of time and I'm busy playing other people's creations as well as other PS3 games, but I do eventually want to do one. I'll be sure to check out that cosmo canyon level you talked about.

edit: one more thing that really amazes me about this game is that despite its simplistic nature, and novel concept, it really is a graphically impressive game and the physics are insane as well.