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Jam-o'-War artwork from Super Mario Galaxy 2.
Artwork of a Jam-o'-War from Super Mario Galaxy 2
First appearance Super Mario Galaxy (2007)
Latest appearance Super Mario 3D All-Stars (2020)
Variant of Jammyfish
Subject origin Jellyfish
Jelly Fish

Jam-o'-Wars[1][2] (also referred to generically as jellyfish)[3] are enemies from Super Mario Galaxy. Their name is taken from the Portuguese man o' war, a hydrozoan resembling a jellyfish. They appear in the Deep Dark Galaxy and the Bigmouth Galaxy. They are a large blue variant of Jammyfish. If Mario or Luigi comes in contact with one, he is shocked. They can be defeated only by hitting them two times with a Koopa Shell, and they give one coin when defeated. After they are attacked once, they glow green but do not act any more aggressively.

In Super Mario Galaxy 2, a Jam-o'-War appears in the Cosmic Cove Galaxy. It behaves the same way as in the predecessor, but instead of giving a coin when defeated, it gives ten Star Bits.


Additional names[edit]

Internal names[edit]

Game File Name Meaning

Super Mario Galaxy
Super Mario Galaxy 2
ObjectData/JellyfishElectric.arc JellyfishElectric Electric Jellyfish
Super Mario Galaxy
Super Mario Galaxy 2
電飾クラゲ (Denshoku Kurage) Illuminated Jellyfish

Names in other languages[edit]

Language Name Meaning
Japanese ビリデカユラリ[4]
Biri Deka Yurari
Compound of「ビリビリ」(biri-biri, onomatopoeia for electric shocking),「デカい」(dekai, big) and「ユラリ」(Yurari, Jammyfish)
French Méduse Jellyfish
German Riesen-Qualle Giant Jellyfish
Italian Elettromedusa[5] Electric Jellyfish; shared with Jelectro
Spanish (NOE) Electroaguamala Electric Jammyfish


  1. ^ English Super Mario Galaxy entry on the official Mario Portal. nintendo.co.jp. Retrieved August 13, 2022. (Archived August 12, 2022, 23:39:09 UTC via archive.today.)
  2. ^ English Super Mario Galaxy 2 entry on the official Mario Portal. nintendo.co.jp. Retrieved August 13, 2022. (Archived August 12, 2022, 23:39:46 UTC via archive.today.)
  3. ^ Black, Fletcher. Super Mario Galaxy PRIMA Official Game Guide. Pages 214 and 264.
  4. ^ Shogakukan. 2015. Super Mario Bros. Hyakka: Nintendo Kōshiki Guidebook, pages 128 and 161.
  5. ^ Super Mario Bros. Enciclopedia; pagg. 128 & 161