In the game the player takes control of the Yamato battleship (which was sunk off Kyuushuu during World War II), firing at enemy ships and planes while avoiding missiles and torpedoes.
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Pretty rote naval shooting gallery game.
A much better Space Invaders derivative than N-Sub. It's just as mechanically simple but the pace is far more hectic and makes for a more compelling arcade experience. I especially like how the time of day changes as the rounds go on, a simple yet effective reminder of the story of the Yamato itself. One of the better early SG-1000 offerings.