The arrival of the Japanese version of the game coincided neatly with Sonic's 10th birthday, and to mark the occasion, Sega released a limited edition version complete with art book, commemorative coin and music CD, with the latter including tracks from a wide range of Sonic games.
Offered in a colourful cardboard slipcase, this '10th birthday pack' of the game features the standard retail version in a jewel case, with the other goodies bundled in a gatefold cardboard case.
The package was apparently only sold for two days in Japan, according to the back of the box, but copies aren't that hard to come by these days.
Do you happen to own this version of Sonic Adventure 2? Let us know in the comments.