
YEEEEEEAAAAAH!
Differences between the PSP and DS version noted thus far, there's voice acting which I'm almost certain wasn't in the DS version but I could be wrong.
The undo button on DS only goes back one move, on PSP you can go all the way back to the start of a level if you keep pressing it. This is goooood.
Holding the R Button during the tutorial levels (I say tutorial levels, they're just the "easy" set really, but they work as tutorials because you can view solutions) auto-solves the level like in the DS game, but here it counts as completing the level if you use it, whereas in the DS you had to solve it yourself.
Barely any loading times.

Easy and medium are unlocked to begin with, like in the DS game. There's no "empty" slots but I expect more difficulties.
Music is the same but the quality is better. Ace
My experience of the PSP version is still very limited, but it absolutely looks like the version to go for if you have the choice.
Actually, if you're really forgetful, the DS version is the way to go, as the PSP doesn't auto-save as far as I can tell. Saving is done by pressing triangle on the level select screen. Not really an issue unless, as I say, you're likely to forget!
Still yet to unlock the new PSP mode...
Game of the millennium.
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