Your are Poseidon and you can control sea waves. Use LEFT and RIGHT ARROW KEYS to move your hand up and down to make the ship tip over. But beware! Dont let it sink.
Your object in this small game is to make a cruise ship tip over and kill all of the passengers.
Square Enix has launched their Dragon Quest 8 Official Community website called SlimeKnights. I'm a huge fan of the series, literally the second console game I ever played, after the original Super Mario Bros. game, was Dragon Warrior I (since you couldn't avoid playing Super Mario Bros. - it came in the Nintendo box).