When you begin a new game, you start out by flying through Corridor 0, the entrance to Naju. In the beginning only a few small green asteroids fly past you. Then a series of blue asteroids will form a circle in front of you. When the circle is complete, they will all become red and fly toward you at once. Orange diamond shapes will fly down from the top of the screen and nearly reach the bottom before flying back up. The next enemy to join the fight will be a set of blue orbs that are incredibly difficult (but not impossible) to kill. You lack enough fire power to make a serious dent in the blue orbs, so avoid them. Finally, a set of red jet fighters will travel straight from the top of the bottom.
The best strategy is simply to hold down and fire constantly. Whenever you kill anything, there is a chance that an item capsule will be released. However, in order to capture what it contains, you must be able to shoot at it long enough to make it open, and then fly over the contents. When you are traveling very fast (fast enough to have a single large burst of fire coming from your engines, as opposed to two small afterburners) you may find it very difficult to stay in front of the capsule long enough to open it. Do your best to preserve your health until things slow down so that you can collect energy restoring items.
After your speed slows down, you will be presented with four pairs of gun turrets that appear on either side of a central alley. The turrets are protected by hatches that open and close, and they can only be damaged when the hatch is open and the turret is exposed. Each turret fires a slow small bullet that you can destroy with your own gun fire. Sometimes, destroyed bullets will create item capsules. When you're past the four turret pairs, you will reach the corridor boss: Naju's defense grid, a massive array of small and large turrets, whose hatches open and close. The small turrets are destroyed quickly by your gun fire, but the large turrets take a substantial amount of damage to destroy. All the while, every exposed turret will be firing bullets at you.
Throughout the fight, your own gun fire must be able to fire past the bullets that are being shot at you. They will occasionally create items, some of which will appear right on top of the turrets, both functioning and destroyed. Capsules that land on active turrets become concealed by the animating graphics, but they are still present. Be careful when attempting to collect the items contained in the capsules. There's also a good chance that your score will extend beyond 30,000 while fighting this boss. This initiates the first automatic health increase, extending your energy meter from 8 to 9, and restoring all damage in the process. When the last turret is destroyed, the corridor is complete and you will enter the main area of Naju.
- Start - X11 Y12
- You begin in the very center of the Naju labyrinth, in what is referred to as Area 0. Every other area can be accessed through Area 0, but you must first obtain the correct keys to access them. Your ultimate goal is to reach Corridor 1 and obtain the key that leads to Area 1, but first you should do a little exploring in order to power up the Guardian. In this first room, you can read the message left by an unknown author, who describes the fate that befell his home "star" (planet more likely) Naju, when evil races invaded it in an attempt to take it over. This person tried to initiate the self-destruct sequence and left the message for anyone who happens to find it in case he failed. From here, shoot the left door until it opens, and head through it. Destroy the enemy creatures that you encounter and travel west until you reach room X8 Y12 which contains a set of yellow pyramid blocks arranged in a giant W (for west), and travel north one screen. (Optionally, you may wish to visit one screen to the east first before traveling west, and collect the Rapid Fire item from X12 Y12.)
- X8 Y11
- X8 Y9
- if you wish to activate it for the button weapon. Now travel east for six screens, passing the large N for North, but do not attempt to destroy the black oscillating orbs in one room along the way.
- X14 Y9
- X12 Y12
- X13 Y10
- X13 Y13
- X13 Y11
- X9 Y14
- X8 Y13
- X7 Y10
- Shoot through the yellow pyramids that surround the door on the left side of the room, and then shoot the door open and pass through it.
- X6 Y10
- Area 1, but you will also earn the Repeller weapon as a prize upon your return to the labyrinth.
This corridor possesses a clear underwater aquatic theme. The first enemy that you encounter in this corridor are thin green fish who travel down the left and right sides of the screen. Once they are low enough to be at the same level as you, they begin to swim across, before swimming back up to the top. Focus on attacking the fish which appear on one particular side, and dodge the fish from the opposite side as they cross (or use the Multi-Bullet weapon to attack them from the side.) Eventually a stationary creature will begin appearing in the middle, and it will fire bullets at you as it passes by. After a few of those creatures go by, a manta ray will fly down the left side of the screen. When it reaches the bottom, it glides back up to the top and then very quickly down to the bottom again. Seahorses appear shortly after that. They behave similarly to the green fish, only they travel across the screen until they line up with you, and then quickly jet up or down. While the sea horses attack, a large stationary plant that fires bubbles all around it will appear.
You'll be attacked by a combination of seahorses and fish until only fish appear. A set of three bubble-firing plants will appear at one point. When the seahorses begin to appear again, they are joined by a new enemy, a red orb that appears from the bottom of the "sea bed" and digs a trench upward along the floor. It fires tiny squids that act like homing missiles at you, which are easily shot down. Destroy the orb while avoiding the seahorse attacks. The fish will return, along with another red orb on the right side of the screen. Four manta-rays will attack, alternating which side they appear from, before you encounter another red orb down the middle of the screen. More fish will appear, along with a pair of bubble-firing plants. Then the enemies will stop appearing, and the warning sirens will indicate the presence of the corridor boss.
The boss of corridor 1 is a gigantic fish known as a Fleepa. This Fleepa is blue, and it starts out at the top of the screen. It swims down to the bottom of the screen in an attempt to bite the Guardian, before swimming back up to the top of the screen. As soon as it hits the top, it immediately dives back down for it's next attack. As it opens and closes its mouth, more of the tiny squid that behave like homing missiles are released. You must shoot at the Fleepa long enough to destroy it, but you don't want to stand still and have bites taken out of you whenever it reaches the bottom of the screen. Shoot at it long enough until you have no choice but to move out of the way. Fly to the left or the right, wherever there is more room to maneuver, and quickly get back underneath it as soon as it retreats enough. Combine your regular weapon with a special weapon like the Multi-Bullet or the Wave Attack to increase your destructive power.
Every now and then, a destroyed squid may turn into an item capsule. However, if the Fleepa is near the capsule, it can be difficult to get a clear shot at it long enough to open it. If you notice an item capsule rising to the top of the screen, lure the Fleepa away from it for a while so that you can get a clean shot at it and collect the contents. When Fleepa is finally destroyed, you will earn the key that will open up the first two areas of the game. You will also earn a special weapon when you return to the labyrinth, the Repeller. When you arrive, shoot the door above you and use your new acquired key to access Area 1.