Complete Walkthrough of Level 5 ("Gaussly" Mercury)

===NOTE: You should not start from this level but at least from Level 4 instead. Otherwise you cannot complete this level.===

Start by looking up. You should see an Energy Centre and an Earthshaker behind a force field. Look deeper into it and you should see 2 Smart Missiles on the left and the right. The path is blocked by force fields on both sides.

Now there are 4 doors:
1) in front, the door leads to the boss.
2) behind, the Exit.
3) the left, a secret door to the Earthshaker.
4) the right, another door to the Earthshaker.

Note that the doors on the left and the right are locked on both sides (so you cannot open it with Guided Missiles).

After all the "crap", open the door. (The door will stay open.) Before you attempt the boss, look far and you should see some slightly darker walls. Those are illusion walls:

       O A O
       O O O
       B O C

(O means there are no walls.) "A" contains an Earthshaker, "B" an Extra Life and "C" some Smart Missiles. The only thing to be concerned about is the Earthshaker. Hide near the force field and shoot a Guided Missile outside, through the wall "A", and turn straight up, through the grating and into the lava. Follow the lava, make turns at the corridors, and hit the switch at the end. Doors 3 and 4 as mentioned above has been opened (they stay opened). (You may go in to pick up the shield boosts.)

However, the missiles are still not accessible. Shoot another Guided Missile through the wall "A" and up into the lava falls, this time go straight (make no turns in the lava) and you will go through a fake lava wall and hit a switch inside. This switch deactivates the 2 force fields inside. The force field below the Earthshaker cannot be deactivated for it is just an obstacle designed to block your way.

That's it! There are very little secrets on this level, so now you may go out to meet the boss. Just below outside the door is an illusion wall, containing an invulnerability. Use it wisely on the boss. (As soon as you go out of the door the robot makers are triggered and you will fight against a substantial amount of Diamond Claws and BPERs plus the boss and 2 Red Fatty Jr.) The 2 Red Fatty Jr drops 3 Energy boosts and 2 Shield boosts each.

Pick up all the stuff in the room (plus the missiles in "A", "B" and "C") while / after fighting the boss. Once the boss is destroyed it is likely that the robots from the robot makers are also killed. All walls behind the robot maker are illusions, again. All 4 contain 1 hostage. Rescue them, and head for the Exit.

Level 6 (E.A.R.T.H.S.H.A.K.E.R) can prove to be a real challenge! See you!