Play as Sonic/Tails and Knuckles and win each level.
You can't (But to unlock Shadow + Amy, you type in 5953131313131313)
no, but you can unlock knuckles, amy, and cream.
no you cant but you can unlock amy and shadow just enter in the code 595313131313131 then you will get abillites and characters enjoy
you have to beat the story of sonic, tails or knuckles.
impossible. there are only codes to unlock all abilities plus shadow and amy.
go to passwords choose enter password then type 595313131313131 you now have shadow and amy
u need t ofind a number on the web
I think Sonic and Amy are more popular than Shadow and Amy.
the characters are sonic,amy,tails,shadow,silver,jet,blaze,knuckles,and king arther
Yes you can by completing all of the adventure modes of Sonic, Tails, Knuckles, Cream and Amy.
If you are talking about for Sonic... There are no Amy Rose or Shadow skins for him. Try to make a texture hack. That seems to be the only way.
She's a fangirl of Sonic the Hedgehog.