Sonic & Knuckles Collection (Game) - Giant Bomb

A Windows PC release which includes Sonic the Hedgehog 3 and Sonic & Knuckles, as well as the ability to play the combined "locked-on" version of the two together, and "Get Blue Spheres!" as a menu option.

Sonic & Knuckles Collection Box Shot for PC - GameFAQs

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Sonic & Knuckles Collection (1996) - MobyGames

Sonic & Knuckles Collection (Game) - Giant Bomb