Sonic Plus Mega Collection – Playstation 2

Sonic Plus Mega Collection - Platform: Playstation 2

How to Unlock Sonic 3 & Knuckles:
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Submitted by: Tasbih

To unlock Sonic 3 & Knuckles, you have to play Sonic The Hedgehog 3 and 
Sonic & Knuckles enough times and you'll see a screen says: " 
You can now play Sonic 3 & Knuckles