Yes, this is a party supply (it's a paper party plate) but it is also likely super rare, and arcade exclusive. This plate can only be gotten at Gameworks arcades, and then, only if you rent the party room and have a party with food/cake. Because that's an expensive thing to do, and also because it's considered a disposable item/gets cleaned up by cleaning staff or just thrown out by guests, it's also a rare item. This was a spare plate that was unused, and collected at an opportune moment. It's great to see that Gameworks has chosen Sonic to star on their stuff, and that they've chosen a nice new stock art for him too. There are likely to be other party goods (napkins, cups etc) with this same theme.