Hoth
Destroy any of the three probe droids that are floating around the area Each carries a different droid powerup
Naboo
Bump the chess pieces into their opposing pieces to receive a droid powerup Note Some chess pieces will release different powerups
Tatoonie Dune Sea
Blast the Sand Crawler until it stops moving Enter the open mouth of the Sand Crawler to receive a droid powerup Repeat this to get a different droid
The Death Star II
Destroy the TIE Fighters or wait for them to destroy each other They will drop a droid powerup upon their demise
Yarvin 4
Destroy any of the three guard towers to release a droid powerup Each of the three towers has a different droid