Sonic the Hedgehog 3

Knuckles the Echidna first appeared in the game Sonic the Hedgehog 3 for Genesis in January of 
1994.  This game, like Sonic the Hedgehog 2, also allows a single player to choose either the 
Sonic or "Tails" character, and also includes two-player split-screen competition.

Sonic the Hedgehog 3 takes place on the mysterious Floating Island which holds many special 
powers.  The source of these powers are the Chaos Emeralds.  In Sonic the Hedgehog 2, Sonic and 
"Tails" thought that they had destroyed the Death Egg, which was Dr. Robotnik's heavily armored 
ship.  Instead, Dr. Robotnik managed to crash land on the Floating Island.  After learning that 
the island is able to float in the sky by harnessing the power of the emeralds, the Doc decides 
to steal the emeralds so he can repair his Death Egg ship.

To obtain the emeralds, Dr. Robotnik tricks Knuckles, the guardian of the Floating Island's 
Chaos Emeralds.  He also tells Knuckles that Sonic and "Tails" are the ones trying to steal the 
emeralds.  Once Knuckles believes Robotnik's lies, he'll do whatever it takes to stop Sonic and 
"Tails".

Between battling the new types of Badniks and trying to outsmart Knuckles, Sonic and "Tails" 
have their work cut out for them once they arrive on the Floating Island and search for Dr. 
Robotnik.

Knuckles was born and raised on the Floating Island and he knows all of its secrets.  He's 
strong, athletic and clever.  Because Knuckles knows every hidden passageway on the island, 
it's easy for him to block Sonic's path, create extra obstacles, set traps, and steal Sonic's 
gold rings.

Long ago, an ancient civilization lived on the Floating Island.  Before this civilization 
mysteriously disappeared, it left behind many secrets and mystical powers.  Being the only 
living descendant of this lost civilization, Knuckles has become the guardian of the Chaos 
Emeralds, which are the source of the island's special floating power.

Fun facts about Knuckles
Age:   15 Years Old
Species:   Echidna
Favorite Foods:   Fruit (especially Grapes)
Special Abilities:   Discovering hidden passageways and using his knuckles to dig.