Bomberman Live - Platform: Xbox 360

Easy costumes:
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Select "Local Play" and set it to a one on one match. Select the 
Classic arena, Zombie mode, and a three minute time limit. Start the 
match leaving the other options as default. Wait until the timer 
approaches one minute, then get the orb. Exit the game as soon as 
they "Yay" sound confirms you have the orb. Select the "Local Play" 
option and repeat until all costumes are unlocked.