Level Select:
Select Chewbacca as a character, set the difficulty level
to standard, Player change to no.
Complete the game in Practice or Arcade mode.
Level select may now be accessed in versus mode:
Use L2 and R2 to choose arena.

Alternate costumes:
Hold L1 at the character selection screen and choose
your character.

Fight as a Stormtrooper:
Settings as in Level select, only with Han Solo and only
complete arcade mode.

Fight as Darth Vader:
As above only with Luke Skywalker.
NB: When playing as Darth, secret character Mara Jade
will appear instead of a mirror match.

Fight as Mara Jade:
Set difficulty to Jedi, Player change to no and continue to
no. Select Team mode and hold L1+L2+R1 before the first match
starts. Defeat the Empire and Mara Jade is yours.

Fight as Slave Leia:
Settings as above and complete game in arcade mode on Jedi setting.

Big Head Mode:
Select Vs or Practice mode.
Hold select after choosing a character and keep button held
until match begins.

If you break the preset high score on survival mode with difficulty set to
standard and player change set to no, you can be a character called Jodo
Kast.

Full screen:
As above only with SELECT+L1+R2.