|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, Cooperation Ninjutsu|
A technique created by Orochimaru. Kabuto uses eight seal tags to summon the Mugen Castle. The castle can absorb the people's vitality and is also capable of destroying the land where it stands. When the castle is destroyed by removing the eight seal tags, it disappears without a trace.