Alternate costumes
After your character dies, hold [L] + [R]
when choosing a character. Release the buttons after your character
reappears.
Unlimited time
Highlight the desired number of players at the main
menu, then press [L], [R], [Right]x2, [Left]x2,
then hold [L] + [R]. Release the buttons when the character
selection screen appears.
Use same characters
Hold [L] + [R] at the battle mode character
selection screen to use the same character as the other player.
Level select
Level 2: Hold [L] + [R] + [A] + [B] + [X]
+ [Y] + [Right] on controller two at the mission briefing
screen until it disappears.
Level 3: Hold [L] + [R] + [A] + [B] + [X]
+ [Y] + [Down] on controller two at the mission briefing
screen until it disappears.
Level 4: Hold [L] + [R] + [A] + [B] + [X]
+ [Y] + [Left] on controller two at the mission briefing
screen until it disappears.
Level 5: Hold [L] + [R] + [A] + [B] + [X]
+ [Y] + [Up] on controller two at the mission briefing
screen until it disappears.