Knuckles is an ECHIDNA, a type of spiny anteater which lays eggs.
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You can only get Knuckles in Sonic 2 if you stack Sonic 2 and Sonic and Knuckles on the Genesis. Otherwise Knuckles cannot be played in the game.
A boy (Sonic's first game is not really Sonic the hedgehog it is a racing game & Sonic is an air freshiner and it was made a few months ago before Sonic the Hedgehog was made in 1991)
1:Sonic the Hedgehog 2 2:Sonic Adventure DX 3:Sonic Advance 2 4:Sonic 3 & Knuckles 5:Sonic the Hedgehog 5: Sonic the Hedgehog 4: Sonic Advance 3 3: Sonic Adventure 2: Sonic & knuckles 1: Sonic CD 5: Sonic the Hedgehog 3 4: Sonic the Hedgehog 3: Sonic the Hedgehog (2006) 2: Sonic and the Secret Rings 1: (what? not sonic cd?) Sonic Adventure
There isn't one that is just Sonic the hedgehog 2, but there is the Sonic Classic Collection which has 1,2,3, and Sonic & Knuckles
sonic the hedgehog 1,2 and 3. sonic cd knuckles' chaotix