|Secret Technique: Summoning: Mugen Castle|
|Rōmaji||Hijutsu: Kuchiyose: Mugen-jō|
|Literal English||Secret Technique: Summoning: Infinite Phantasm Castle|
|English games||Hidden Jutsu: Summoning: Mugenjo|
|Game||Naruto: Ultimate Ninja Heroes 2: The Phantom Fortress|
|Classification||Hiden, Ninjutsu, Space–Time Ninjutsu, Collaboration Jutsu|
Kabuto uses eight seal tags to summon the Mugen Castle. The castle can absorb the people's vitality and capable of also destroying the land where it stands. When the castle is destroyed by removing the eight seal tags, it dissapears without a trace.
- Orochimaru was mentioned to be the inventor of this technique.