From the Super Mario Wiki, the Mario encyclopedia
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The Boo Mushroom is a type of Mushroom that appeared in Super Mario Galaxy and Super Mario Galaxy 2 and turns Mario into Boo Mario or Luigi into Boo Luigi. It is a white mushroom with a Boo-like face. It is the least used power-up in Super Mario Galaxy, found only in the Ghostly Galaxy, Sand Spiral Galaxy, and the Boo's Boneyard Galaxy. It is used only once in Super Mario Galaxy 2, in the Boo Moon Galaxy.
The Boo Mushroom gives Mario the power to do several things that Boos can do, such as float through walls and fly. He can become intangible if the player shakes the Wii Remote and he can then go through the object. Another effect of being Boo Mario is that Mario will attract other Boos towards it and those Boos will make him lose the form by touching him. The only other way to become Mario from Boo Mario is to go into a light beam.
Super Mario Galaxy
In the mission Luigi and the Haunted Mansion, the Boo Mushroom appears for the first time in the game at the end of the level when Mario has to free Luigi. It is found in an alcove behind a moving light. Mario must then use the mushroom to travel through two grates and free his brother Luigi, though he gets too scared of Mario in his Boo form, so the player has to use a nearby light to turn back to normal and free Luigi.
Sand Spiral Galaxy
The Boo Mushroom reappears in the mission Choosing a Favorite Snack where Mario has the choice of either the Bee Mushroom or the Boo Mushroom. If Mario chooses the Boo Mushroom he will turn into Boo Mario and have to travel over quicksand. There is a boo at the start who will see Mario and fall in love with him, chasing him until it gives up. Mario must also dodge the beams of several lights to avoid losing the Boo Mushroom.
Boo's Boneyard Galaxy
Super Mario Galaxy 2
Boo Moon Galaxy
In the mission Haunting the Howling Tower, Mario (or Luigi) must use the Boo Mushroom to go through walls and progress to the top of the tower.
Puzzle & Dragons: Super Mario Bros. Edition
Boo Mushrooms are Skill items in Puzzle & Dragons: Super Mario Bros. Edition. They are used to transform allies such as Red Koopa Paratroopas into Dry Bones or Buzzy Beetles into Bony Beetles, and can be obtained from ? Blocks or dropped by Dark attribute enemies defeated with 10+ combos such as Big Boo, Boo Crew or Boo Trio.
Super Mario series
Super Mario Galaxy
Super Mario 3D All-Stars
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