Robot World is the third world. It is notably more difficult than Cave world, as the level now has edges Ikk can fall off of, which instantly kills him regardless of how much health he has.
One difficult aspect of the level is the fact that Drones can spawn incredibly high up in the air, while Trophyturrets can spawn on the underside of the islands. This can make killing all enemies in the level difficult, as the player must be able to maneuver high up in the air (using the Ball, for example) and get under the islands without falling to their deaths.
The main theme of this area is "The Swamps"
The Robot World generates islands of various sizes, which the player must navigate without falling. Often, these islands are close enough you can jump from one to the other without too much difficulty. Some gaps may have disappearing platforms above them.