Final Fantasy Crystal Chronicles: Crystal Bearers Cheats :
Secret - Medal 315 Demon Wall
Warp to a Ghost City and defeat the Demon Wall. Lock onto the door in the middle and shake the remote in the direction of the arrows to open it. Lock onto one of the skeletons on either side of the door and shake them towards the face in the door to damage it. Keep doing this until you defeat the wall. If you have an accessory which causes damage when you roll, just equip it and roll into the face instead.
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