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
Beat certain bosses on the right difficulty to unlock them as playable characters in versus mode.
Unlockable How to Unlock 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
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More One Piece: Unlimited Cruise 1: The Treasure Beneath the Waves