Spiral Upper

The Spiral Upper is a move performed by Knuckles the Echidna. It first appeared in Sonic Adventure 2 and Sonic Adventure 2: Battle and later in Sonic Advance 3. It is a technique where Knuckles performs a spinning uppercut.

Usage
When Knuckles performs the Spiral Upper he shoots himself directly high into the air while spinning around. In Sonic Adventure 2 he does it with such speed that he leaves afterimages. He then delivers a direct uppercut to whatever enemy that might be above him. In gameplay it is done by rotating the control stick in a 360-degree angle and pressing the action button.

In Sonic Advance 3, Knuckles can only use the Spiral Upper when his partner is Tails. Here, Knuckles must be the character the player controls, and Tails serves as the character that follows the controlled character. With Tails' influence, Knuckles' Double Punch is automatically transformed into the Spiral Upper. In this game, Knuckles does not jump nearly as high as in Sonic Adventure 2, but the force from the jump engulfs his fists in fire and gives him a wider attack range.