As the name suggests, the stage is related to bubbles. The music is Aqua Illusion.

The stage is filled with bubbles that break into smaller pieces when shot. It doesn't start off too bad, but soon, GIGANTIC bubbles fill the screen, although its not hard to eliminate them.

Keep an eye on the enemies from the hatches, as they will release bullet barrages.

The boss is Bubble Eye.

Gradius III
Ships Vic Viper
Stages Sand StormAqua IllusionIn The WindHigh Speed DimensionEaster StoneDead End CellFire ScrambleCosmo PlantAccident Road (SNES exclusive)Crystal LabyrinthBoss RushMechanical BaseUnpleasant Cell (SNES exclusive)
Bosses GoliathBubble EyeIron MaidenBig Core MK IIIDogasVaifTwin Vaif (SNES) • GregolWyvernVulture DragonChoking WeedLizard CoreBeacon (SNES) • Zub Rush MK IITetranCovered CoreBig Core MK IICrystal CoreDeath MK IIDellinger CoreDisruptShadow GearShadow Dancer (SNES) • Big CoreBrain GolemBacterion