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Yeah... I noticed that they replaced ageia when I bought Sonic And the Black Knight... On Sonic And The Secret Rings, it said "PhysX by ageia", while SATBK says "PhysX by NVIDIA", I looked it up, and NVIDIA bought out ageia. They use the NVIDIA physics engines now...

EDIT: http://en.wikipedia.org/wiki/Ageia

I thought it was old news, so I didn't say anything about it...