Cheat Mode
To activate these cheat codes, you need to start a new game, then enter "Decter's Dinner" and go to "Enter Code".

BEQ82H = Princess Leia
L54YUK = Rebel Trooper
A32CAM = Darth Sidious
VR832U = Disguised Clone
MS952L = Mace Windu (Episode III)
RS6E25 = Clone (Episode III Walker)
N3T6P8 = Clone (Episode III Swamp)
BHU72T = Clone (Episode III Pilot)
ER33JN = Clone (Episode III)
SF321Y = General Grievous
ZTY392 = Grievous' Bodyguard
14PGMN = Count Dooku
EUW862 = Shaak Ti
CBR954 = Kit Fisto
DP55MV = Ki-Adi Hundi
A725X4 = Luminara
LA811Y = Bobba Fett
PL47NH = Jango Fett
XZNR21 = Super Battle Droid
LK42U6 = Battle Droid (Geonosis)
19D7NB = Geonosian
F8B4L6 = Clone
H35TUX = Darth Maul
92UJ7D = Padme
PP43JX = Royal Guard
DH382U = Droideka
EN11K5 = Battle Droid (Commander)
987UYR = Battle Droid
KF999A = Battle Droid (Security)
R840JU = PK Droid
U63B2A = Gonk Droid

The codes below needs activation in the "Extra" menu when you press "ESC" after you have entered them like the above cheat codes.

NR37W1 = Silly Blasters
L449HD = Classic Blasters
IG72X4 = Big Blasters
SHRUB1 = Brushes
PUCEAT = Tea Cups
LD116B = Minikit Detector
RP924W = Moustaches
YD77GC = Purple
MS999Q = Silhouettes
4PR28U = Invincible

Unlocking the "?" door
To unlock the "?" door found at the episode selection room, you must achieve True Jedi Status in all of the seventeen levels, 6 in Episode 1, 5 in Episode 2, and 6 in Episode 3. True Jedi Status is the black/golden bar that appears at the top of your screen during any episode level. The way to fill up this bar is by getting a certain amount of studs during that level (each lvl has a different required stud amount.) Once all levels have True Jedi Status, the "?" door will be unlocked.

Unlockable Characters from the ? Door
When you reach True Jedi Status in all 17 levels, the ? door opensin Dexter's Diner. Finish the mission for the following unlockables.

Darth Vader - Complete the mission behind the ? Door
Stormtrooper - Complete the mission behind the ? Door
Buy Princess Leia from Dexter - Complete the mission behind the ? Door
Buy Rebel Soldier from Dexter - Complete the mission behind the ? Door