The rainbow gem is an incomplete gem that's supposed to let you transform into super sonic but it doesn't work. You can only get it by hacking.
instead of hacking complete all town and act missions with s rank on silver sonic and shadow and you will have the gem
try buying the sky gem again
you have to beat the game in all story modes and beat the extra boss
You have to hack the game cause the rainbow gem was unfinished. so hacking is the only way to get it.
you cant.
The anagram of sonic the hedgehog "sonic the hedgehog."
sonic the hedgehog
sonic the hedgehog
Sonic the Hedgehog
Sonic the. Hedgehog
Sonic the Hedgehog
Sonic the Hedgehog