LEGO Star Wars II: The Original Trilogy Cheats

Enter one of the following codes to unlock the corresponding character for purchase in free play mode:

PEJ821: Tusken Raider
JAW499: Jawa
YDV451: Sand Trooper
NAH118: Greedo
SGE549: Palace Guard
CYG336: Rebel Pilot
EKU849: Rebel Trooper from Hoth
NBP398: Red noses on all characters
CL4U5H: Santa hat and red clothes
GBU888: Skiff Guard
NYU989: Snowtrooper
PTR345: Stormtrooper

Infinite Studs
When in a double score area with another human player, kill them and collect their studs. Repeat this to gain the desired amount of studs. The amount lost will remain the same, while the amount gained after picking your partners up will be doubled.

A way to get unlimited Studs is by going to Free Play mode on CoOp, on the 1st level, getting a Sith, then by going out of the first door. Then, walk towards that open door to the right, then it will turn into a black door. Then, get your Sith character to use the Force on the black door, and go into that Double Score Zone. Then, start killing the other character and grabbing the Studs he drops out at double value. Keep doing this to pretty much get unlimited Studs.