Defeating Kaizack
To defeat the final boss, shoot off all his arms. He will stay motionless. Enter his mouth while continually firing your weapon. If you have enough hit points you will easily defeat Kaizack and win the game.
Finding The Subterranean City
To find the Subterranean City, you must get out of the city of the forest. Next, you must go right two screens and up seven screens. After that, go to the three blocks that look like a right angle, and go under the bottom left one and walk toward it and it will move. Go into the hole and you will find a city that has very powerful weapons and armor.
Light Saber
To acquire the Light Saber (the best weapon in the game) you must first get the Silver Sword. The Silver Sword is located in front of a gravestone on the screen to the right of the Subterranean City. Then warp to the Heavenly City and enter the Heavenly Palace. The Light Saber will be laying on the floor at the most northwestern point of the palace. Once, you have the Light Saber, sell the Silver Sword, it will be useless now. Remember, you MUST have the Silver Sword to get the Light Saber.
Sound Test
Follow the directions above to go to the deserted village. To hear the sound effects, go to the upper left building. In this building you can cycle through the different game sounds!