Unlocking Characters
You can unlock most characters by playing through all of the game's levels. You must buy others using the Lego studs you collect in the game. You can also use codes to easily access many of the unlockable characters. Enter "14PGMN" for Count Dooku, "19D7NB" for Geonosian, "92UJ7D" for Padme, "987UYR" for a battle droid, "A32CAM" for Darth Sidious, "BEQ82H" for Princess Leia, "ER33JN" for a clone and "EUW862" to get Shaak Ti.
Helpful Items
Breeze through levels with easy with the code "4PR28U," which makes you invincible. You can still die from falling off ledges, so watch your step. Get the minikit detector with the code "LD116B." This device points out the location of the hidden minikits in each level. Collect all of the minikits in a level to construct a vehicle from the "Star Wars" universe.
Funny Bonuses
Give your characters moustaches with the code "RP924W." Have them wield comically oversized blasters with the code "IG72X4." Give them "silly blasters" by entering "NR37W1".
The Mysterious Door
You probably noticed the door with the question mark on it in the episode selection room. To open this door you must get "True Jedi" status in each of the game's 17 levels by collecting enough Lego studs. This number varies by level. Smash everything you can to collect lots of these studs. Once you unlock the door, you get to complete one more mission. If you succeed, you will unlock some more characters, including Darth Vader, Stormtrooper, Princess Leia and Rebel Soldier.