Ultra-Big Ball Rasengan

This technique adds natural energy to the Big Ball Rasengan. The natural energy rapidly increases it to gigantic proportions, is larger than the user's own body, and is created in an instant. Unlike Naruto's Big Ball Rasengan, it can be used with only one hand. If the Ultra-Big Ball Rasengan exploded, it would easily hollow out an entire mountain.

Trivia

 * In the anime, Shikamaru tells Naruto to use this technique, though he didn't know what it was. Naruto smaller Rasengan that is bigger than a regular Big Ball Rasengan. Naruto does this despite not being in Sage Mode, even though the technique is officially classified as senjutsu.