That definition is too narrow. There have been several games released for modern consoles that were on-line or mail order retailer exclusives. The one I think is the best example is Daytona USA for the Netlink. That was only available by calling Sega Parts. It was nonetheless an official release. Of course, most of the Telegames batch of Jaguar games were pretty much mail order only (although copies were purchased and sold by a few other Atari vendors) and I don't know of any physical brick and mortar store that actually stocked them. It would also exclude games from the classic era that were mail order only as you mentioned. Is Chase the Chuckwagon an unofficial release because it was only available as a mail away premium? Seriously, you need to give this fight up. Bingo is official, end of story.