Nextgen
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Remember that Assault Rigs does not remember from one level to the next which view you would like to use. So if you would like to change it, press the Select button until you find the view you are most comfortable with.
The four rooms are Red, Green, Blue, and one the looks like a Bubble Texture on the wall. The Red room has the exit block in it, so there is no real reason to go into it until you have found the six gems. The first room you should go into is the Blue room.
The Blue room has one gem in each far corner, a Gun Turret, and a Homing Missile weapon. When you first enter the corridor from the main room into the Blue room, you have to make a few turns, either left or right, to get into the main part of the room. The gun turret is sitting in a position that can not be easily seen, so don't just rush in and grab the gems and Homing Missiles. Slowly creep around the corner and try to shoot the Gun Turret from the side, or just swing out in a nice big strafe to draw the fire of the gun turret away from you. Only shoot the big blue box once to release the Homing Missiles. If you shoot the missiles themselves they will disappear. Once you get the two gems, head back into the main room and go into the Bubble room.
The Bubble room is pretty much the same as the Blue room, but instead of a gun turret there is a Wakka to contend with. Simply equip your Homing Missiles with the L2 button and creep around the corner into the main part of the Bubble room until you see the Wakka. Shoot the missile and wait for the announcer to verify that it was hit. If you missed it on the first shot just try again. If you need to you can strafe around the Spider to shoot it. Get the two gems in the Bubble room then return the the main room and head into the Green room.
The Green room is pretty much the same as the Blue and the Bubble rooms but the enemy is a Floater, there are mines on the floor, and the weapon is the Shatter Ammo. It is possible to shoot a Homing Missile at an angle to hit both one of the mines and the Floater in one shot. If you need to shoot the remaining mines, do not shoot the blue box more than once as you will destroy the shatter ammo. Pick-up the last two gems and head for the Red room.
When you enter the corridor to get to the red room, turn left, and then to the right. You should be
able to see the exit block, but if you can't just run into or hit the push blocks out of the way until
you can reach the exit block.