Build the gate by carrying the two gate pieces which are on the platforms to the gate base on the ground. After that you will start receiving fuel tanks from space. Transport the fuel tanks to the gate. When you have collected enough fuel, the gate will activate and is ready to be entered. Use the 4 and 6 keys to move left and right, to activate your jetpack. Use 5 to fire. You can pause the game by pressing the 0 button. Points are scored for each enemy you destroy, for building the gate, and for bonuses that you collect. If the enemy, asteroids or other debris crashes into you, you lose a life. After you have lost all your lives the game ends.