This is what Al Nilsen just said on Twitter: "That's why we airfreighted all of the Sonic 2 cartridges directly to over 13.000 retail stores so that they would arrive the day before Sonic 2sday. This was unprecedented, but it was only way to enforce a street date. To learn more check out Ch 39 of Console Wars." He didn't respond to anything with any thoughts about where the June 23 date came from. Maybe he doesn't know or remember. Ch 18 of Console Wars says: "Unlike movies, books, and music albums, in 1991 there was no official release date for videogames. When a game hit stores was a matter of logistics, not premeditation. There were just too many variables and too many unaffiliated retailers; besides, mostly the product came in from Japan in dribs and drabs. As a result, there was no game-changing D-day for Sonic The Hedgehog but rather a period of several weeks in late June and early July when the blue blur started showing up in stores." But yeah, as the book has a lot of questionable or downright wrong info in it and no quotes or citations, it's not clear if that's just coming out of Harris's own thoughts or from one of his sources. I think he's just setting up the Sonic 2 release with that.