All Working Final Fantasy Crystal Chronicles: Echoes of Time Cheats - DS

Unlock Hard Difficulty
Beat the game once to unlock the Hard difficulty level.

Unlock Very Hard Difficulty
Beat the game on Hard to unlock Very Hard difficulty.

Replay the Final Dungeon
After the ending of the game, back to the gate and examine the "stuff", leave the place will see the final dungeon is available again.

Unlock Hidden Characters
Complete the indicated task to find the corresponding hidden character:

Assassin (female Selke) - Have a large friends list then search the world map near Desert Ruins in Multi-player mode under the Hard or Very Hard difficulty.
Gerald (male Clavat) - Have 1,000 kills, then search the world map near the Forest under the Hard or Very Hard difficulty.
Penguin (female Lilty) - Search the front the Library under the Very Hard difficulty.
Red Mage (male Selke) - Search the Library, then pay 5,000 Gil to recruit.