Tricks:
Go to "Options/Passcodes" and use the following codes - (You´ll hear a click if you did it right)
JHGNRGAS ?- Access to all levels.
FMRYLDAD -- "Dark Side" Level.
EOWXZGAS -- Freezeframe.
DIWMZIAR -- Show credits.
HRDTOKIL -- Advanced shield.
RQORACAQ -- Access AAT.
LFZWKXAA -- Unlimited lives.
XFIIYBAY -- "SwampSpeeder".
JOBXXFAI -- Gallery.
RECTVBAH -- Concert hall.
CXSJMIAA -- One shot kills.
ABVUSEAY -- Heat-seaking function.
NASTYMDE -- Game gets harder.
FRBPTDAY -- Sith infiltrator.