CheatCodes.com has all the official Crystalis Game Boy cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Saturday May 25, 2013 for Crystalis are shown below.
When you enter the unknown cave, go to the one where it's the first puzzle. Go out with an escape rope and then walk back in. You will find a hole in the wall. Walk in and there will be good item.
Go to the temple with ghosts. If you defeat them without revealing them, you will get about 1000 exp. points.
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