In this game you've entered some kind of underground cave on another planet. As you try to navigate your way through, you have to destroy enemy spaceships and force fields. You go to the target grid by moving the joystick and firearms by pressing the red button. You can see the ships coming from a distance, but if they get too close, they will shoot at you, causing you to lose energy. If you see a force field, you will see a box to the right. Shot on the area to turn off the field. If your vehicle gets into a field, you lose energy. You get energy when you destroy the ship or disable the force field. Use the map on the top of the screen to determine which way to go, left or right. If you choose the wrong path or run out of energy, the game is over.