To get admiral akbar in the bounty hunter missions you go left, open the door, then go to the water tank, then drain it and tada he is there
Now to get luke you go to the shiny thing, blow it up, then build the lego, push it, then pieces will fall, build that and press circle on it and you will get to luke
More tricks, tips and cheats for this game are right here - LEGO Star Wars II: The Original Trilogy cheats
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