 Other gadgets can be used in combat as a means to distract foes, and others are needed to unlock certain doors and thus continue missions; in these cases, the player typically must solve a puzzle minigame in order to successfully use the gadget and unlock the door.Each game is broken down into a series of missions that take place on numerous planets across the galaxy.While most objectives must be completed in a certain order to progress the main story, other objectives are optional but can lead to useful rewards.