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.

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Mario & Sonic at the Olympic Winter Games Characters - Giant Bomb

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Sonic & Knuckles (Game) - Giant Bomb

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Sonic the Hedgehog 2 - Wikiwand

Blue Sphere, Sonic Wiki Zone

Sonic & Knuckles (Game) - Giant Bomb

Sonic & Knuckles Collection Ultra 2000 Series, PC