A shy ghost that lurks in icy underground stages. Boos chase Mario when his back is turned but freeze in place — hiding their face — when Mario faces them directly. They cannot be defeated by any means in the original Super Mario Bros.
Completely invincible
Completely invincible
Freezes in place
Still invincible
You cannot defeat a Boo — they are invincible. Face them directly to freeze them in place, then carefully route around them while they are stationary. Never turn your back on one in a tight corridor.
World 1-1
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World 2-1
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World 3-1
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World 4-1
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World 5-1
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World 6-1
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World 6-2
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World 7-1
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World 8-1
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World 8-2
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World 8-3
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World 8-4
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