This level is easier than it looks. The reason that the level is believed difficult because of the common mistake in going into the upper ring after entering the blue door. There is an easier way to defeat this level, which will be described here. In addition, this level contains the secret exit to the Third Secret Level.

• NEVER enter the upper ring after you enter the blue door. You will know that you are in it if you see or hear robot generators....

Once you enter the level, fire at the wall in front of you. This will open a secret room with homing missiles and a shield powerup. Save those for later.

Go around and take out the Class 1 Heavy Drillers in the next room. Once you have taken them out, enter the door and take out the Class 1 Heavy Drillers and the Gray Platform Robot lurking around the corridor.

Next, enter the corridor right next to the blue door. Pick up the energy powerups, and then pick up the fusion cannon, if desired. Destroy the Medium Hulks and the Grey Platform Robots in the room that the corridor enters. Then, pick up the missiles and head down the door indicated to grab the blue key.

The cloaking device and invulnerability indicated on the map should be saved until you are ready to enter the blue door.

Once you enter the door indicated, you will encounter a Class 1 Heavy Driller, which should be taken out.

Next, look for a hole in the ceiling. You will see the blue key. Go up, grab the blue key, and quickly back up through the hole. By this time, the secret doors will have opened, releasing Grey Platform Robots. Destroy them as they come into the hole.

You should access the blue door in the opening area. There is another blue door, but it leads directly into the upper ring and is not recommended.
 
 

Once you entered the blue door previously described, and crossed through the foyer, destroy the Defense Robots and look for a passageway in the ground. Once you have found it, destroy the Class 1 Drillers and Class 1 Heavy Driller located here. This will clear the yellow key and you are free to grab it.

Go around the ring and take out all the enemies. The lower ring is guarded by Grey Platform Robots, two Fusion Hulks, and Class 1 Heavy Drillers.

The lower ring is not contiguous. Be extremely careful not to enter the upper ring from the break.

Next, blow up all the cloaked Class 1 Drillers guarding the hostages. The drillers are located in a side passageway that is mottled blue. Destroy all the drillers.

You may now locate the yellow door indicated on the map to find the red key.

This key is guarded by two Super Hulks and some Class 1 Drillers(I am not sure about that). Destroy all the drillers and one Super Hulk, and grab the key. Then, take out the other Super Hulk(which is lurking on the other side of the key).

You will have to return to the lower ring and access any of the remaining yellow doors. Once you have entered the yellow doors, make a left or a right turn and open the yellow door that you see. This will lead you to the hostage cell doors. Blow up the hostage cell doors, but don't rescue the hostages yet.

Before rescuing the hostages, take out the Class 1 Heavy Driller at the normal exit. Then go all the way down the room.

The bottom is extremely dark, so use your flares to light the bottom. Take out the Super Hulk guarding the red door.

The secret exit to the Third Secret Level is located here as well. Use your lasers to fire the wall at the point indicated on the map. This will open a room with a mega missile. Fire the wall behind the missile and the corridor to the secret exit will open up.

The reactor room is guarded by four Super Hulks. Stay close to the floor near the red door and slowly move forward. Take out the Super Hulk as soon as you see it in your sights and repeat for the other Super Hulks. If a homing missile is fired, slide back towards the red door.

Once you have destroyed all the Super Hulks, grab all the weapon powerups and go rescue the hostages. Then, take out the reactor, and go to the exit desired.

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