This secret level is the hardest secret level. However, if one is cautious, this level can be easily conquered by staying out of a particular room as much as possible, hitting enemies at long range, and moving cautiously and rapidly. 

• One should avoid the Upper Sandwich Room(discussed later). However, you will have to enter it to rescue the hostages and attack the reactor.

When you enter the level, use your lasers or your plasma cannon and open the door in front of you. If your detail level is set at the highest, you should be able to see the Class 1 Drillers lurking around. Aim at the drillers and fire. This will take them out.

Next, if desired, hit the wall to your left. This will open a room with a vulcan cannon, which you may take if desired. Then, enter the side passage to your right and take out any enemies that you encounter, but do not enter the door ahead of you.

Now, select either door and open it, but don't go into the Lower Sandwich Room. Cautiously move your ship so you have a shot at one of the Super Hulks in the room. Once you do, use your plasma cannon(if you have one) or your vulcan cannon and take it out. If you have hit it correctly, the Super Hulk won't be aware of you. Repeat for the other Super Hulk at the other door.

Enter the room and aim up. You will be fired upon by several cloaked Class 1 Drillers. When you see them fire, aim and destroy them. Then, turn around, go up slightly and take out the Fusion Hulks that you see. Then, go to the other side of the room and take out any enemies that come out.

To grab the blue key, access the door shown on the map.

Once you enter the door indicated on the map, you will see the blue door. Turn right and you will come to this room indicated on the map.

This key is minimally guarded. You should have no problems grabbing this key. Once you grab it, head back to the way you came and open the blue door.
 
 

The yellow key is guarded by Medium Hulks, cloaked Medium Hulks, and other minor enemies. You will have to take out any enemy that is blocking your way to the key, and if you have proximity mines, lay them in the robot generators.

Once you pass the trigger point(you have to pass it to grab the yellow key), the robot generators will activate, forming Medium Hulks and cloaked Medium Hulks. Just destroy any that is blocking you way out of the room and leave by the blue door.

You may either go into the Upper Sandwich Room to access the yellow door(which is not recommended) or you may head back down to where you found the blue key and going past it for a short distance, when you see the door to your left.

Enter the yellow door and go through and destroy any Medium Hulk in your way. You will soon come to this room.

This room contains the exit to your right. Turn left and go up onto the bridge and turn right. This will lead you to the red key, which is guarded by Advanced Lifters and Defense Robots.

If you turn left on the bridge, you will come to a cache of energy and weapons powerups guarded by Defense Robots.

Once you have grabbed the red key, you will leave the room by way of the yellow doors right next to the bridge. This will take you into the Upper Sandwich Room. Find the Super Hulk guarding the red door and destroy it as quickly as possible. Then, go to the only door without a color.

The plain door will lead you to the hostages. Before you can grab them, however, you will have to destroy a Green Platform Robot, several cloaked lifters, and two Defense Robots jamming the corridor. Once you enter the door, you should see the enemies. Aim your plasma cannon and destroy them all from where you are.

Once you have destroyed all the enemies, open the hostage door and rescue the hostages. Then, pick up the mega missile in the secret room in the floor.

Return to the Upper Sandwich Room and head for the red door.

This reactor is guarded by two Super Hulks and two Class 2 Drones. You should take out all enemies before attacking the reactor.

Once you enter the reactor room, turn right. Quickly destroy the Super Hulk in the niche. Then, go to the middle corridor leading to the reactor and destroy the other Super Hulk.

Now, go around to the back and take out the Class 2 Drones and the reactor. Once you have blown the reactor, take the invulnerability and head for the yellow doors in the Upper Sandwich Room. Once you enter the doors, the robot generators there will activate. Quickly take out any enemy blocking your way to the exit and get out of the mine.

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