Mech. Bio Strong is a boss from Super Darius II. It is shaped after a fish egg.
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Mech. Bio Strong remains stationery at the right of the screen, only beginning to attack after the player destroys the mound of flesh in the front, after which it will also remove its mask. Its attacks include firing a salvo of homing missiles, shooting fireballs diagonally upwards, firing a straight laser from the gun on its belly, extending its tongue forward and spitting miniatures of the original Bio Strong which shoot at the player when destroyed. Once the flesh from its arm is destroyed it will also fire a machine gun from its wrist. Its weakpoint is on its head.