Quoted:
Those two downloads are the Famitsu and QUO contests:There's an original Japanese release which is amazingly buggy, and then they released a fixed version a few weeks later. Then they fixed it even more with the U.S. release/Sonic Adventure international.
You can tell whether or not you have the very original Japanese release if two early, Japanese only downloads for the game work with it. They don't work in the fixed version, nor any others. (SA:I, SA US, etc.) I think you can still get those two downloads off booyaka. Mine are archived on my VMUs.
Other than using that method, I'm not sure how to differentiate between them, though there's probably some way.
Did anyone here about this at all, long ago? Back then all I had for the latest news was the latest issue of SEGA Saturn Magazine, so I don't recall hearing anything.QUO Contest (Japan) -- Locate and collect the QUO cards around Station Square. (QUO cards are pre-paid cards produced by Japan Card Center Kaisha, one of Sega's sister companies under parent corporation CSK. QUO cards are accepted at 10,000 convenience stores, restaurants, and gas stations across Japan.) Compatible only with the original glitchified Japanese version. 34 blocks.
Famitsu Contest (Japan) -- Locate all five hidden hedgehog pictures in under ten minutes. 18 blocks.