First, find the following five characters in the corresponding locations. After finding all five characters, Han Solo can be purchased in Free Play mode for $100,000. C-3PO In the Lost Temple after you snag the idol fire an explosive at the gray wall. Smash the blocks he is enclosed in.
Luke Skywalker In Into the Mountains go to the area with the collapsing ice bridges.Fall down the third one and blast the wall of ice to free Luke.
Chewbacca In the City of Danger go to the last room with the truck. Decipher theglyph panel to find the cantina and crawl through the vent to reachChewie.
Princess Leia In Free the Slaves go to the fourth area. Go down the railings and blast the rubble. Use the soldier door to find her.
R2-D2 In Desert Ambush, in the first area, go the left side and use a high jumper to get up top. Head left and use the whip platform to lower a Sandcrawler tube. R2-D2 will pop out.