One Piece Unlimited Cruise: Episode 1 Cheats

New costumes
After beating the game, start a new game + on hard mode, and you will find a treasure chest on the Sunny with the key to lockers. Go to girl's room, and you will be able to change the costumes of your characters

Unlock special combined attack
Finish all 50 rounds of survival mode, and a chest containing a certificate will appear. You can now perform a new special attack with Nami, Usopp, Robin and Brook

Unlockable Characters/Modes
Beat certain bosses on the right difficulty to unlock them as playable characters in versus mode.

Aokiji: Beat him him on normal difficulty
Arlong: Defeat him in Survival mode
Calgara: Defeat him in Survival mode (20th round)
Enel: Beat him him on normal difficulty
Evil Guardian: Defeat it in Survival mode
Final Boss: Beat him in Hard mode
Hard Mode: Beat the final boss on island 5
Krieg: Beat him him on normal difficulty
Kuma: Beat him in hard mode
Kuro: Beat him him on normal difficulty
Monster Point Chopper: Defeat him in Survival mode
Moria: Beat him him on normal difficulty
New game + (and transferable save to Unlimited Cruise 2): Beat the final boss on island 5
Nightmare Luffy: Defeat him in Survival mode
Spandam: Beat him him on normal difficulty
Survival mode: Read monument on final island
Wapul: Beat him him on normal difficulty