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Complete the following goals to unlock the corresponding costume for the indicated character.

After unlocking Shanks and Mihawk, successfully complete the entire move set for all The Straw Hat Pirates in training mode to unlock a third costume for them inspired by the Color Walk books.

Unlock all the characters to get a new title screen that features everyone.

Win the Davy Back Fight min-game the indicated amount of times to unlock the corresponding bonus:

Groggy Ring: 4 times
Donut Race: 10 times
Crash Rush Boxer (the box breaking): 18 times
Snow (getting rid of snow): 26 times
Breaking Krieg's Armor: 29 times
Sanji & Zoro voice (announcing): 33 times; also need all support character voices unlocked
The "Fix" sign: 34 times

After unlocking everyone, successfully complete their move lists in training mode. After doing so, destroy all the pillars in the stage. Do this with every character to unlock the stage.