After spotting this on eBay it seems this game was released on both Naomi 2 (sorry system16.com) with a proper case and Naomi 1 in a metal box (the version I have).
I suspect the Naomi 2 version is really the Naomi 1 game as Naomi 2 is backwards compatible. Why exactly Sega would do this I have no idea, but why would they port it to Naomi 2 either?.
