Actually, being able to lock-on Sonic 3 with Sonic & Knuckles is a pretty big deal. When playing only either of those games alone, you only get half of the Sonic 3 story. With lock-on, when you play the game, as soon as where Sonic 3 normally ends, spoilers, I guess... instead of the Death Egg exploding, it continues to fall toward the island and you continue the rest of the story through the Sonic & Knuckles levels, to which you also get a new (read: the true) ending afterwards.
Just saying.
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