Big-Head Mode: In Arcade, VS., Survival, Team, and Practice modes, select your fighter, then press and hold Select until the fight begins. When the fight starts, your character will have a giant head.
Tyler Duvall
Granada, CO
Play as Mara Jade: Set the difficulty on Jedi, and at the main menu, put the cursor over Team Mode and simultaneously press and hold L1, L2, and R1. While holding these buttons, press X. If you did the trick correctly, the computer will auto-select your team (Leia, Luke, Chewbacca, and Han) and the words "Battle for Mara Jade" will appear onscreen. If you beat the computer team, a hidden character, Mara Jade, will now be selectable at the fighter-select screen.
Nick Storer
via Internet