Level 2. Zilla Construction

Start inside a tunnel; a rockslide will block your view of the train. Proceed through the large hole ahead.

On the right wall, climb the ladder and collect any items. Jump down into the largest area on your (minimap (the small circular map in the bottom-left corner of your screen)) (a map displayed on your HUD (heads-up display — the on-screen icons showing health, ammo and the minimap)).

Head towards the red-lit area on the right (not a door). Look for a figure on the wall that says "Portaku Inc. We carry your load!".

Enter the door nearby and turn left. Interact with the "Pull" sign to reveal an opening with a switch. Activate the switch and return outside.

Go up the small stairs to the office room. You will notice the power is out, though the computer (with a "260" on it) is still working.

Defeat all enemies in the office. Find Uzi ammo inside a locker.

To the right of the entrance, enter another door and pick up the Yellow Key and other items.

Return to the large opening. A red-lit door can only be partially opened; ignore it for now.

To the left of this door, enter an opening and hug the right wall. You will reach the yellow key door.

Use the Yellow Key to enter the red-lit room. Defeat all enemies and proceed forward until you see a sign that says "Zilla Enterprises".

Head left, staying close to the right wall. You will find a RED KEY in a crack.

Go to the right of the "Zilla Enterprises" sign and open the door. Defeat all enemies here.

To the right of the "Operations" sign, you will find the red key door. Use the Red Key to enter.

Defeat all enemies inside. Jump up into the opening where a brown ninja was to find a tool kit and the Blue Key.

Activate the switch here to open (covers) (protective barriers) allowing easier return to the large opening.

Go back to the large opening and locate the broken forklift. The blue key door is to the northeast.

Use the Blue Key to enter the door and go down the ramp.

Ensure the leverage is set to the right side, then hit the switch to restore power.

Return to the Machine Room (where you found the Red Key). Use the two generators there. One will provide an infinite amount of Uzis, and the other will generate a GOLD KEY.

Collect the Gold Key. Go back to Operations, through the red key door, and around to the gold key door.

Enter the gold key door, proceed down the path, and defeat any (rippers) (enemy type).

Locate a white square object. Behind it is a switch. Activate the switch.

A cylinder-like object will drill a hole in the ground containing water. Dive into the water and enter the opening. A teleporter will appear, ending the level.