Enter these codes at the bar in the Mos Eisley cantina to unlock the specific item or items:

Code - Effect

4PR28U - 10 extra studs
HGIGHF - Earn 500,000 Bonus LEGO Studs
UDLRAB - Unlock all Characters
867539 - Unlock all Clothing in Character Editor
ABACAB - Unlock all Extras
BIGGUN - Unlock all Weapons in Character Editor