Battle Shark is an arcade game that, judging by its title, likely involves shooting and destroying sharks. The different regional releases (Japan, US, World) might indicate variations in graphics, sound, or gameplay. The exact mechanics are not clearly documented. It was likely a simple shooter with a focus on quick reflexes and aiming accuracy.  Further information on the developer and precise release dates are needed.

Battle Shark (Japan, Joystick)

Battle of Atlantis (set 1)