As you perform certain actions in the game, you can unlock the corresponding content and upgrades, as indicated below.
Green Light Saber - Complete the Path of the Jedi episode
Obi-wan Force Upgrade - Complete level 25 of the Death Star
Path of the Jedi - Earn a 3-star rating on all Tatooine and Death Star levels
Deflect Laser Beams
To solve a tricky puzzle you may find that you will need to deflect the laser beams that are fired from the turrets using either a Lightsaber Spin or Force Push.
Golden Droids
Collect the Golden Droids that are hidden throughout the game as these will each unlock a bonus stage featuring C-3PO and R2-D2.
Laser Beams
Laser beams will slice through almost anything but will bounce of metal, use this to your advantage by redirecting any laser fire you may be receiving around corners.