Obliterate
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This level is set-up in the shape of an X. At two opposite ends of the X are the exit in a room with a few gems and room that is exactly the same except it only has gems. There are enemies and weapons in these room also. These rooms are connected by an uncovered corridor. The other opposite ends of the X each have a tower with ramps, enemies, gems, and weapons throughout them. The two towers are connected on their highest level with two fast moving platforms.
Start out by going to room without the exit in it. You will find a Laser, a few gems, and some enemies. Get the laser first to make quick work of the enemies in the room and the Shatter Wakka that usually follows you from the corridor. To keep from getting hit by the mines, shoot at them from the beginning and strafe out of the way of their shrapnel.
Leave the first room and take the doorway to the left. Destroy the Small Gun Turret with your Laser and pick-up the gem and Homing Missiles. For the rest of the levels of the towers use your Laser and the Minigun when you get it and destroy all the enemies you can before they have a chance to fire at you. The easiest way to do this is by going up the ramps between the levels slowly and turning and strafing up to the top of the ramps while shooting at the enemies.
If you do this it is possible to destroy the enemies from halfway below the floor and therefore they won't see you. You might only get one or two shots off before you slide down the ramp, but keep at it and you won't take much damage. There is no point to shooting the enemies that in the other tower from a distance since they will respawn by the time you get over to the other side. The only time you should do this is when you are on the top of the first tower.
From the top of the first tower use your Laser if you have any shots left to destroy th enemies at
the top of the second tower before taking one of the moving platforms across. It is not advisable
to use the Homing Missiles because they will sometimes direct downward to the lower enemies
instead of going straight across the gap. Don't take too long in shooting the enemies from across
the gap because the enemies on the side you are on respawn quickly. When a platform stops on
your side quickly move onto at least the middle of it. If you are near the side that touches your
tower, you can slip off when it moves to the next side.
Make your way down the second tower by shooting your Homing Missiles at the enemies from the
ramps in order to destroy them before they can shoot you. You can also go down the ramps
sideways to shoot the tops of them without taking damage from their shots that are too low. On the
bottom level pick-up the Guided Missiles and steer them down the corridor to the right in order to
destroy the Missile Turrets and other enemies in the room with the exit block before you venture into it to pick-up the last of the
gems and proceed to the next level.