In Blaster Master: Blasting Again the Acceleration Blast is the final attack used against Kaiser after defeating him though conventional means. Sophia J-7 undergoes a transformation that basically locks it to the ground and activates an enhancement to the cannon. It is evidently fueled by all the emotions that Roddy has because his Mother tells him to pour all of them into the Acceleration Blast, saving Elfie and defeating Kaiser.

This upgrade reappears in Blaster Master Zero that can be obtained after defeating the Venom Master and can be used whenever you want but only if Sophia's SP is full.