Acid Burst

Acid Burst, also known as Acid Rush (アシッドラッシュ) in Japan, is an acidic weapon that X gains from defeating Toxic Seahorse. When fired, it creates a glob of acid which, upon contact with any surface, will split into four smaller acid drops. These little acid drops do not do as much damage, but cover a wider area. X can also fire this weapon straight up or straight down by pushing up or down on the control pad. When charged, X will fire two balls of acid which bounce five times in the direction he is facing.

This weapon is Tunnel Rhino and Dr. Doppler's weakness. 