Stand still and press Y to change the B action to Sunglasses press B to put them on now you can find secret items keep in mind they come off anytime you press A or X you can have these on while underwater but if you press A or X they will come off. Also the screen will turn blue try to ignore that its a mechanic that's kinda letting you see what knuckles sees basically and you do need this item for hard mode missions for his stages.
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There are goggles but their not called goggles, they are called sunglasses.
No he cant. Only on sonic adventure, sonic adventure 2, sonic DX and sonic adventure 2 battle.
knuckles first level. You must have mystic melody but you get it in that level anyway.
He may one day, it is possible.
Sonic is better than knuckles everything shows knuckles is weak knuckles loses every battle sonics better.