This page contains Sonic Adventure Hints for Dreamcast called "Clone characters" and has been posted or updated on Oct 5, 2006 by zachokxp. Let us know what you think of this Hint by thumbs voting.
Play through the game (with all the characters) until Super Sonic is unlock. In Super Sonic's Adventure, go to the crashed island. You will see Knuckles and Eggman (Robotnik). After the FMV sequence, press A + B + X + Y + Start. Then, choose Knuckles. Return to the same place to find two Knuckles. Note: This also can be done with other characters.
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