Level 13: Europa Mining Colony
Enemies: Class 1 Drone, Class 2 Drone, Medium Hulk, Super Hulk, Medium Lifter, Cloaked Lifter, Advanced Lifter, Spider Processing Robot, Baby Spider, Driller, Heavy Driller
Begin by taking out the Drillers hiding in the corridors to the left and right, and then take out the Medium Lifters in the tunnel going down. Follow the tunnel down to a large dark room to find the Blue Access Key.
Go through the door opposite the key to find the Blue Door. The path by the lava leads to a Mega Missile. Come back and take the door to the left which leads to another large open room.
You’ll need to do a bit of backtracking from here on. Head down the passage behind the door in the center of the wall and go past the Red Door. Somewhere in this area past the Energy Center you’ll find the Yellow Access Key. Make your way back past the Red Door and follow the other path to the Red Access Key and the Hostages. Notice that the exit is in the roof just in front of the prison door.
Head back once more to the Red Door and take out the Heavy Lifters on the other side. Open the next Red Door to the reactor room.
Reactor: Continue around the large corridors until you see the reactor which is protected by Super Hulks. You may be able to take out the reactor by shooting it around the corner without worrying about the Hulks. Once the reactor goes down get ready for a long run back to the exit.
Exit: Back out both Red Doors, through the Yellow Door and then up the tunnel above the door to the hostages.