Bowser Jr.'s Robot Reactor



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Introduction
Bowser Jr.'s Robot Reactor is Bowser Jr.'s first galaxy in the game Super Mario Galaxy. In it, Mario fights Megaleg to earn a Grand Star.

1-up Mushroom
There is a 1-up Mushroom on the Starting Planet. You have to get the bullet bill to smash the glass cage in front of you.

New Mix Planet
This is a very small planet. Mario is required to entice a Bullet Bill to follow him and break open a cage to reveal a Launch Star, and then use that Launch Star to reach the Robot Reactor. This metal planet has a black hole that Mario needs to avoid. There are also other cages that can be broken to reveal coins or a 1-Up Mushroom. It is also infested with several Astro Goombas and regular Goombas, which make it slightly harder to traverse the narrow pathways while being pursued by a Bullet Bill.

Robot Reactor
This is where Megaleg is found and battled. It is fairly small and orange-brown, with many technologic symbols all over it. It has small rectangular areas on it that are transparent and seem to have computer components inside them. Despite Megaleg's probable immense weight, the transparent panels never break if Megaleg stomps on them, all that happens is a cloud of dust rises up. In the underside, there are several glass containers that can be destroyed with the help of Bullet Bills for items.

It rotates the New Mix Planet.

Megaleg's Moon
In this mission, you have to find the Launch star. But, before you can use the launch star, you have to get a bullet bill to chase you to the glass cages that hold items, and the Launch star. Then, after you've done that, head on over to Megaleg's Moon. You have to fight Megaleg to get the power star. You have to climb up the robot's leg and go all the way until you find some bullet bills. Have them chase you and go to the cage that stores the power star. Repeat this 2 times. After you've done it, the Grand Star is yours and Megaleg is now defeated.