In Free mode when you reach the part where you have to pull the levers to place the bombs next to Darth Vader, after you place the bombs use a Bounty Hunter to throw a Thermal Detonator. When it reaches the bombs, set off the Detonator. It should set off the bombs with one shot.
Admiral Ackbar
IG-88 can open any door. Go to the panel to the left and open the door. Then, use your thermal detonators to blow up the wall of junk. Next, build the thing next to the chamber. Ackbar should be inside.
Bounty Hunter locations
Mission 1 (R2D2): Enter the Bounty Hunter area. Keep going forward, then stop once you reach a wall. Enter both holes at the side of the wall. Legos will fly out. Build it into a doorway. Inside is R2D2.
Mission 2 (Obi-Wan): 4-lom can open any door. Take him to the lift where the R2D2 control panel is located. Open it and go up the lift. Pull the levers after walking on the foot marks and enter the next room. Use the control panel again and go through to the last room. Obi-Wan is on the right. Smash through the boxes and he will be standing in the small doorway.
Bounty Hunter mode
Purchase all the bounty hunters (Boba Fett, Bossk, Dengar, Greedo, IG-88, and 4-LOM) to unlock the Bounty Hunter mini-game.
Characters
Enter the password on the password entry screen.
Password - Effect
UCK868 - Beach Trooper
BEN917 - Ben Kenobi (Ghost)
VHY832 - Bespin Guard
WTY721 - Bib Fortuna
HLP221 - Boba Fett
BNC332 - Death Star Trooper
TTT289 - Ewok
YZF999 - Gamorrean Guard
NFX582 - Gonk Droid
SMG219 - Grand Moff Tarkin
NAH118 - Greedo
YWM840 - Han Solo (Hood)
NXL973 - IG-88
MMM111 - Imperial Guard
BBV889 - Imperial Officer
VAP664 - Imperial Shuttle Pilot
CVT125 - Imperial Spy
JAW499 - Jawa
UUB319 - Lobot
SGE549 - Palace Guard
CYG336 - Rebel Pilot
EKU849 - Rebel Trooper (Hoth)
YDV451 - Sandtrooper
GBU888 - Skiff Guard
NYU989 - Snowtrooper
PTR345 - Stormtrooper
HHY382 - The Emperor
HDY739 - Tie Fighter
NNZ316 - Tie Fighter Pilot
QYA828 - Tie Interceptor
PEJ821 - Tusken Raider
UGN694 - Ugnaught
CL4U5H - Santa hat and clothes
TYH319 - White beard
Characters from the original Lego Star Wars
Successfully complete the indicated chapter by collecting 10 Minikits within the time limit allowed in Challenge mode to unlock the corresponding character(s) from the original Lego Star Wars:
Collect a good amount of Studs, then go to a special area where the Studs you collect are x2 (for example, Episode IV: Chapter 3 in the cinema). When you get there, turn off all of your "Extras" then drop in you second player (if not already on) and attack the player with all of the Studs. On the fourth hit, the player will die and release Studs. At this point pause the game and turn on any Stud multipliers you have in the "Extras" menu. Resume the game, then collect the Studs dropped by the killed player. They will compound with the x2 of the area. For example, Studs x2 (from the area) x2 (from "Extras" menu) x4 (from "Extras" menu) for a total of x16. Turn off the "Extras" and repeat this trick as many times as desired.
In Episode IV: Chapter 1 - A New Hope, destroy all of the little panels that a Force user can open. You can also go through the Bounty Hunter or Stormtrooper doors and use the Force on all of the little panels on the wall. Another way is to go through the door that can only be opened with a Sith (for example, as Darth Vader). Then, use the 2x Score Multiplier to your advantage.
Play as a Bounty Hunter (Boba Fett, 4-LOM, Greedo, etc.) at the Mos Eisley cantina. Enter any mission. Character bonuses are recommended. Immediately when the mission loads, pause the game and return to the cantina. Once there, go to the outskirts of the cantina and destroy every trash can, ship piece, and platinum object you see with your bounty hunter's blaster and/or thermal detonators. Collect all Studs possible. Repeat this process as many times as desired. This is a quick and easy way to get at least 20,000 to 30,000 Studs each time.
End of Demo Code
Upon beating the demo and getting all 10 canisters you recieve a code for use in the normal game. Also listed in the pause menu once you unlock the three unlockable characters are codes that correspond to each, presumably for unlocking them in the normal game.
Gold Brick bonuses
Collect the indicated number of Gold Bricks after completing all chapters of the listed episode to unlock the corresponding bonus:
Episode IV Character Bonus: 8 Gold Bricks
Episode IV Minikit Bonus: 8 Gold Bricks
Episode IV Super Story: 8 Gold Bricks
Episode V Character Bonus: 16 Gold Bricks
Episode V Minikit Bonus: 16 Gold Bricks
Episode V Super Story: 16 Gold Bricks
Episode VI Character Bonus: 32 Gold Bricks
Episode VI Minikit Bonus: 32 Gold Bricks
Episode VI Super Story: 32 Gold Bricks
Invincibility
In Episode IV: Chapter 5 - Death Star Escape in Free Play mode, use 3CPO to unlock the first door. Then, use someone who has force powers to put together the fridge in the room. The fridge will open and a Super Red Power Block will pop out, allowing you to buy Invincibility in the cantina for 900,000 Studs.
Lego City
Get 60 Gold Bricks, then build the doorway outside.
Minikit Detector
In Episode V: Chapter 5, use the Force on the X-Wing. Then, start walking around the X-Wing. You will get a Red Brick, allowing you to purchase the the Minikit Detector for 500,000 Studs.
Play as secret characters
Note: This applies only to the demo version. First of all, complete the demo, which will unlock the "Free Play" mode.
Then, enter that mode and you'll be able to create 2 characters. Continue playing and you'll see only the two of them in the map. Press the key to switch characters, and depending on the area you're currently in, different characters will appear. You can not only play with most characters from the demo, but also with the Emperor, from Episode VI.
Slave 1
Collect all Minikits to unlock Boba Fett's Slave 1 ship in the vehicle missions.