I picked up a copy of Sonic Adventure at GameCrazy this afternoon, and it said "Not For Resale" all over the case and disc. Furthermore, it was a 2 disc case with a second disc that read "Sonic Adventure 2: The Trial" on it. I have a feeling that it's just a pack-in or something like that, but it's definitely new to me. And I'm sure someone on here knows what the hell this thing is.
So yeah...what is it? :P