In the Sonic Mania game , Knuckles can be a sidekick .
Unlockable options include Sonic 's abilities from Sonic CD ( 1993 ) and Sonic the Hedgehog 3 ( 1994 ) in place of the drop dash and `` & Knuckles '' mode , which allows simultaneous control of any character ( including Knuckles himself ) with Knuckles as a sidekick .
Sonic Mania