anyone pick this up yet? i'm hooked. it's a hybrid puzzle/platformer, a combination of Exit, Cube, Super Paper Mario, and the original Prince of Persia. the story is basically about some dude with psychological problems who visits a shrink that hooks him up to a contraption that allows him to enter his own mind. by defeating each stage within your mind, you get closer to becoming "normal". -- or something like that (not much of a story guy to be honest)
gameplay is pretty challenging, but not frustrating to the point where you just want to give up and leave the game to the dust mites. hitting the [] button allows you to "crush"; switch from 2D to 3D. your objective is to collect enough orbs within the world to exit each stage. the orbs are spread throughout the level and it's up to you to manipulate the environment in 2D and 3D to find 'em all. by switching perspectives and using in-level objects (huge bowling balls, latches, barrels, etc.), you've gotta find the right route to the exit. of course mixed in are secret bonuses that you have to find if you want to get 100% completion for each stage.
anyway, this has dethroned puzzle quest as my PSP goty thus far, but i'm a puzzle game whore so your opinion may vary. i forgot to mention, each stage can last anywhere from 15-45 minutes depending on how quick you figure out each stage. like i said, it's really challenging but you'll feel compelled to complete each stage.