I'm curious as up until recently Wikipedia listed an entirely different release date for the games versus Sonic Retro of NA: May 15, 1997, EU: December 15, 1997. Retro, Giant Bomb, and Mobygames lists both release dates as March 20th 1997, which is odd as it's a Thursday. if I recall correctly games were only released back then on Tuesdays in the US, and Fridays in Europe. I tried googling around for any press releases on the game but couldn't find anything. I can confirm that the JP release date on the Retro wiki is correct as the old Sega JP site shows it. The earliest that it shows up on Sega of America's old website was on March 10th, where it also had a demo, so a release date around that time may hold some weight, but it just seems weird to me that this release date is hidden away. The news page also never mentions Sonic & Knuckles Collection, but I'm going to guess that it was a little less important than Edutainment and Sega Rally on PC.