You can not use the cheat it's only avalible on the ps2 version.
I'm pretty sure you find it in dragon's peak which you have to buy to unlock and it comes with sunburn.
cheat
When turned on, it makes the green, red, yellow, blue, and orange notes look much bigger.
a gem cheat
i need gems
A gem code for ourworld is a1f0f56ec53efdad it really works
Don't cheat find out ur self lol
The September gem code is on this blog, it is only 10 gems, but there are lots of other tips and stuff for the our world community. http://ourworldsuvivourguide.blogspot.com/
After you beat Aquatic Base, go to a computer or the store clerk. You have to buy them, and they are pretty expensive. So after you beat Sonic's story, you can replay the last part to get more money/rings.
1.25 carats
Go to the forest or grotto. Play one of the games where you can get gems. Play until the grayish gem thing turns red. If you want, you can play more and the gem you will get will get more rare and more rare.
Hacking is illegal. Cheat codes have been used by many gamers throughout gaming. If one were to look for a cheat code, one might look on the Dragon City forums.