Big Merman is the fourth boss from Sagaia (Gameboy). It is shaped after a sunfish (Mola mola).
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Big Merman will stay on the right side of the screen, mostly moving forward and back. It shoots wave shots from its fins, drop bombs in an arc from its body turret and shoot straight lasers from its head. Once the body turret is destroyed, the boss will also shoot homing missiles from its head alongside the lasers, and attempt to ram the player after a while. Its weakpoint is on its head, though it only becomes vulnerable when shooting.