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Starreactor

Bowser's Star Reactor as it appear in the game.

Bowser's Star Reactor is the first galaxy where there is a boss battle between Mario and Bowser in Super Mario Galaxy. Here bowser uses the grand star to make a meteor like planet. After Bowser is defeated, the grand star breaks out. After this boss battle you recover all the light for the lower part of the observatory and unlock the kitchen.

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