Tekkyū Dosun

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The title of this article is official, but it comes from a non-English source. If an official name from an English source is found, the article should be moved to its appropriate title.

Tekkyū Dosun
YNI Tekkyu Dosun.png
First appearance Super Mario World 2: Yoshi's Island (1995)
Latest appearance Yoshi's New Island (2014)
Related species
Chain Gate
Shy Guy mace.png

Tekkyū Dosun are large, spiky balls on chains that appear in Super Mario World 2: Yoshi's Island, its remake Yoshi's Island: Super Mario Advance 3, and Yoshi's New Island. They typically appear in castles and forts.

Tekkyū Dosun is wound up by a Boo Guy that sits in the wall. Once it is wound up as far as it will go, the Boo Guy will let go and the heavy ball will drop. If the ball touches Yoshi, Baby Mario will fall off Yoshi's back. The Boo Guys take some time to wind up the maces, giving Yoshi time to safely pass underneath.

Tekkyū Dosun, as well as the Boo Guys that operate them, are invincible.

Names in other languages[edit]

Language Name Meaning
Japanese 鉄球ドスン[citation needed]
Tekkyū Dosun[1]
Iron Ball Thump (Dosun is the Japanese name for Thwomp)


  1. ^ Yoshi's New Island, internal filename G:/content0.game/romfs/tekkyudosun.bch.z