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| Fire Release: Intelligent Hard Work | |
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| Kanji |
火遁・頭刻苦 |
| Rōmaji |
Katon: Zukokku |
| Classification | |
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Fire Release: Intelligent Hard Work (火遁・頭刻苦, Katon: Zukokku) is a jutsu where Kakuzu's fire-element mask fires a small fireball that erupts into a giant fire-storm after making contact with a surface, causing widespread destruction to the area. Since the flames travel along the ground, and cover such a wide area this is a difficult technique to evade.