Bangai-O Prize Edition. The game is the exact same as the original. The only way to tell the Prize Edition apart from the original is if comes with a special sticker, two Bangai-O calling cards signed by a designer (HISASHI FUJITA), and a Bangai-O poster.
One of these five with all the special collector's items is available for sale right now on ebay. This is the first time the game has every come up for sale in auction. All previous sales were private transactions with no bidding.
The seller of this auction has 100% positive feedback but they say in the auction that they will not provide any history or proof that the items are legitimate besides the pictures already shown. The seller claims they didn't get any information like this when they bought it so they cannot provide it to the next buyer. A bit of a red flag, but definitely possible. Unlike art or antiques, most video games do not have provenance when they are sold so you don't know who owned it in the past and can't trace the item to the original owner.
It will be very interesting to see where this rare item ends up, but it is one of the rarest of the rare so it could fetch a very high price.
Let's hear your guesses for the final price in the comments below.
Pictures of the backside of the game, calling cards, and poster.