You can play as Knuckles in the Sonic 3 stages or play as Tails in the Sonic & Knuckles stages—options not available in the standalone versions.
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Upon entering the Sonic & Knuckles stages, players can guide their character into Hidden Palace to transform the Chaos Emeralds into giant Super Emeralds. You can play as Knuckles in the Sonic
And the game plays perfectly. As it always did. As it always should have. Upon entering the Sonic & Knuckles stages, players
Select your ROM as the primary file (the "top" cartridge). Select Sonic 3 as the "locked-on" file.