Final Fantasy Crystal Chronicles: Ring of Fates Cheats

Extra dungeon
Clear the game once and continue the new game+ file. Clear the second Varl Mountain event to access the extra dungeon.

New game ++
Finish the game in New Game + to unlock New Game ++

New game +
Beat the game once and start again on the same file.

Harder Difficulty
To unlock harder difficulties for subsequent playthroughs of the game, try beating each stage once through in their entirety. Then, when you play the stages again, you'll have the option of playing on harder difficulties.