Unlock characters for 'Free Play' mode complete the following tasks and then purchase them from the store for the corresponding amount of Studs.

Unlock Snowspeeder:
Complete the 'Hoth Battle' level

Unlock K-3PO:
Get ALL cannisters in level 'Hoth Battle' and then buy in the store for 630 studs

Unlock Tusken Raider:
Get ALL cannisters in level 'Tatooine' and then buy in the store for 200 studs

Unlock Stormtrooper:
Get ALL cannisters in level 'Blockade Runner' and then buy in the store for 300 studs

Unlock Probe Droid:
Buy the 'Extra Vehicles' extra and then then buy in the store for 500 studs

Unlock Tie Fighter:
Get ALL cannisters in level 'Trench Run' and then buy in the store for 1000 studs

Unlock Vader TIE Advanced:
Get ALL cannisters in level 'Asteroid Chase' and then buy in the store for 3000 studs

Unlock Imperial Navy Trooper:
Get ALL cannisters in level 'Death Star Escape' and then buy in the store for 3400 studs

Unlock Snowtrooper:
Get ALL cannisters in level 'Hoth Escape' and then buy in the store for 3700 studs

Unlock Lando Calrissian:
Complete the level 'Cloud City Trap' and then buy him for 4400 studs

Unlock Wicket W. Warrick:
Complete the level 'Endor Battle' and then buy in the store for 4900 studs

Unlock Slave 1:
Buy the 'Extra Vehicles' extra and then, you can then buy this in the store for 50000 studs

Unlock Imperial Navy Lieutenant:
Get ALL cannisters in level 'Death Star Rescue' and then buy in the store for 5300 studs

Unlock Gamorrean Guard:
Get ALL cannisters in level 'Jabba's Palace' and then buy in the store for 5800 studs

Unlock Scout Trooper:
Get ALL cannisters in level 'Endor Battle' and then buy in the store for 6000 studs

Unlock TIE Fighter Pilot:
Get ALL cannisters in level 'Death Star 2 Battle' and then buy in the store for 7500 studs

Unlock Darth Vader:
Get ALL cannisters in level 'Cloud City Rescue' and then buy in the store for 35000 studs

Unlock Yoda:
Complete the game and then buy in the store for 75000 studs

Unlock Baby Rancor:
Unlock ALL other characters and then buy in the store for 200000 studs

Unlock Emperor Palpatine:
Get ALL cannisters in level 'Emperor Fight' and then buy in the store for 75000 studs

Unlock MSE-6:
Get ALL cannisters in level 'Cloud City Trap' and then buy in the store for 100000 studs

Unlock Boba Fett:
Get ALL cannisters in level 'Sarlacc Pit' and then buy in the store for 175000 studs

In Free Play mode use 3CPO to unlock the first door in Episode IV: Chapter 5 - Death Star Escape then use a character who has force powers to put together the fridge in the room. The fridge will open and a Super Red Power Block will come out which will allow you to buy Invincibility in the cantina for 900,000 Studs.

At the Mos Eisley cantina bar enter 4PR28U

Pay the following amount to unlock the corresponding characters

Episode 4 Character Prices:

Unlock Stormtrooper - Pay 10,000

Unlock Imperial Spy - Pay 13,500

Unlock Sandtrooper - Pay 14,000

Unlock Deathstar Trooper - Pay 19,000

Unlock Beachtrooper - Pay 20,000

Unlock TIE fighter Pilot - Pay 21,000

Unlock Tusken Raider - Pay 23,000

Unlock Jawa - Pay 24,000

Unlock Imperial Officer - Pay 28,000

Unlock Imperial Shuttle Pilot - Pay 29,000

Unlock Grand Moff Tarkin - Pay 38,000

Unlock Greedo - Pay 60,000


Episode 5 Character Prices:

Unlock Lobot - Pay 11,000

Unlock Bespin Guard - Pay 15,000

Unlock Rebel Pilot - Pay 15,000

Unlock Rebel Trooper (Hoth) - Pay 16,000

Unlock Snowtrooper - Pay 16,000

Unlock Han Solo (Hood) - Pay 20,000

Unlock Luke Skywalker (Hoth) - Pay 20,000

Unlock Ugnaught - Pay 36,000


Episode 6 Character Prices:

Unlock Gonk Droid - Pay 1,550

Unlock Skiff Guard - Pay 12,000

Unlock Palace Guard - Pay 14,000

Unlock Princess Leia (Prisoner) - Pay 15,000

Unlock Bib Fortuna - Pay 16,000

Unlock 4-Lom - Pay 30,000

Unlock IG-88 - Pay 30,000

Unlock Admiral Ackbar - Pay 30,000

Unlock Ewok - Pay 34,000

Unlock Bossk - Pay 40,000

Unlock Dengar - Pay 40,000

Unlock Gamorrean Guard - Pay 40,000

Unlock Imperial Guard - Pay 45,000

Unlock Boba Fett - Pay 175,000

Unlock The Emperor - Pay 275,000

Unlock Anakin Skywalker (Ghost) - Pay 1,000,000

Unlock Ben Kenobi (Ghost) - Pay 1,100,000

Unlock Yoda (Ghost) - Pay 1,200,000


Unlock Bounty Hunter Missions
At the Cantina buy the six Bounty Hunter Characters (IG-88, Bossk, Greedo, Dengar, 4LOM and Boba Fett). When you approach the door with Jabba's icon over it it will unlock. Inside is the Bounty Hunter missions.

Complete Challenge mode by collecting 10 Blue Minikits within the time limit allowed in the corresponding level.

Unlock TC-14:
Episode 4, Chapter 1

Unlock R4-P17, PK Droid:
Episode 4, Chapter 2

Unlock Padme, Anakin Skywalker (Boy):
Episode 4, Chapter 3

Unlock Battle Droid, B. D. (Security), B. D. (Geonosis), B. D. (Commander):
Episode 4, Chapter 4

Unlock Droideka:
Episode 4, Chapter 5

Unlock Clone (Episode III, Pilot):
Episode 4, Chapter 6

Unlock Luminara, Ki-Adi Mundi, Kit Fisto, Shaak Ti:
Episode 5, Chapter 1

Unlock Padme (Battle), Padme (Clawed), Padme (Geonosis):
Episode 5, Chapter 2

Unlock Geonosian:
Episode 5, Chapter 3

Unlock Clone (Episode III, Swamp):
Episode 5, Chapter 4

Unlock Super Battle Droid:
Episode 5, Chapter 5

Unlock Queen Amidala, Royal Guard, Captain Panaka:
Episode 5, Chapter 6

Unlock Disguised Clone, Boba Fett (Boy):
Episode 6, Chapter 1

Unlock Jango Fett:
Episode 6, Chapter 2

Unlock Clone, Clone (Ep.III), Commander Cody, Clone (Ep.III Walker):
Episode 6, Chapter 3

Unlock Wookie, Jar Jar Binks:
Episode 6, Chapter 4

Unlock Chancellor Palpatine, General Grievous, Grievous' Bodyguard:
Episode 6, Chapter 5

Unlock Mace Windu, Mace Windu (Ep.III):
Episode 6, Chapter 6

Complete the following tasks to unlock the corresponding effect

Unlock Episode IV Bonuses:
Collect 8 Gold Bricks.

Unlock Episode V Bonuses:
Collect 16 Gold Bricks.

Unlock Episode VI Bonuses:
Get 32 Gold Bricks.

Unlock LEGO City Playground:
Collect 60 Gold Bricks.

Unlock Stud Fountain:
Collect 99 Gold Bricks.

Unlock Bounty Hunter Missions:
Buy Bounty Hunters.

Unlock Cantina Gold Bricks:
Beat Story mode and ALL 10 Bounty Hunter missions.

Unlock Slave 1:
Collect ALL 180 Mini-Kits.