Boo Block

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Boo Block
First Appearance Super Mario World (1990)
Latest Appearance Yoshi's Story (1997)
Parent Species Boo

A Boo Block[1] (originally known as Boo Buddy Block[2]) is a combination of a Boo and a Block first appearing in Super Mario World. When looked at, it seems to be a normal, gray block. But if Mario takes his eyes off it, it slowly begins to transform into a Boo. They are actually required to clear a certain Ghost House, Choco-Ghost House, as Mario must lure them towards him, turn around, and jump on and leap off them to reach a high ledge, where the exit door awaits.

Boo Blocks return in Yoshi's Story, now also known as Block Boos[3]. They appear solely in Stage 6-3: Ghost Castle. Their Ghost Block[2] form is redesigned with pink and white strips rather than being a solid gray block.

In Super Mario Sunshine, there are Red Boos which turn into solid platforms when squirted. These, too, are needed to complete certain levels.

Blocks that look similar to Boo Blocks appear in Mario & Luigi: Bowser's Inside Story in the Energy Hold.


  1. ^ Yoshi's Story official website (Wayback Archive). Retrieved December 20, 2015.
  2. ^ a b Mario Mania, page 51.
  3. ^ Yoshi's Story official website (Wayback Archive). Retrieved April 22, 2015.