I'm with Stats on this one. I don't see anything within the platforming portions that defines this game as not for the casual gamer. The inclusion of physics is neat, but doesn't necessarily mean the game is more difficult.
Casual gamers can play the 50 levels on the disc and then take their pick through the levels online if they so care to.
Hardcore gamers will play through those 50, and then try to mess around with the level creator, even if they don't have a specific goal of creating a level, just to see what they can do with the physics.
That's how I see both groups playing the game.
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