Level 18. Floating Fortress

At the start, eliminate the ninjas at the top using the Missile Launcher or the mounted gun.

The large door ahead is locked. Dive underwater and swim beneath it. Surface on the other side.

Head towards the "Zilla Enterprises" sign, eliminate the female ninjas there and on the "103 ship".

The door under the sign requires a red key, and the door on top of the "103 ship" requires a blue key. Dive back underwater.

Use your compass to find the middle of the ship underwater, aligned North and South. A square surface will appear. Dive up into a dark room filled with female ninjas; clear them out and proceed to the next room.

Locate the brown ninja, hit the switch, then find the red ninja and hit the "Manual Override" (red-lit switch) to cause an explosion that blows open the "Level" window.

Go to the "Level" window (next to the "Pump" window), hit the switch inside to gain access to the "Flood Control Dam" room.

Enter the "Flood Control Dam" room, hit the switch to open the adjacent door, entering the mechanism room.

Kill the ninjas on the top right, then go up to the wall with switches. Hit switches 2 and 3, which lowers a panel. Hit the "Pump" switch to activate something.

Locate the Serpent Boss in a room. Blast through the steel fence with missiles and kill it.

Find a floating crate, use it to jump to where the Serpent Boss was, and pick up the RED KEYCARD.

Enter the twirling water to return underwater beneath the ship. Surface and proceed to the red key door. Use the red key to open it.

Inside, kill the baby rippers and head to the Northwest corner. Turn around to find a switch. Hit it, and something will rise. Use crates to jump onto the risen platform, then jump to the portable medikit, and then to the other side.

A little to the left, hit another switch to lower a door below.

Go through the door. Inside, find a switch below a tool kit that illuminates the room. Kill all ninjas.

Approach the steamed vehicle. Female ninjas will spawn on top of crates; kill them.

If you need a repair kit, it's on top of the crates; use the forklift to jump to it. Repair the steamed vehicle.

Blast the crates (set compass to East) and hit the switch to create a way forward.

Go through the opening and grab the BLUE KEYCARD. Baby Rippers and a Serpent will appear; kill them.

Return to the blue key door on the "103 ship" (top level) and use the blue key. Go through and up the ladder to the upper level (radar room and captain's room). Kill any rippers and stock up on items.

Head to the lower level (dining room). Kill everyone. In the kitchen, find Uzi ammo behind the freezer.

Go through the right door (next to the red-lit ladder) and kill everyone. Take the first door on your left to Medical (Medlabs), kill everyone.

Take the first right to the locker room, kill ninjas. Find ammo behind lockers and grenade shells in the shower room.

Go back out and head West to the bedroom. Kill the two ninjas. Behind the C. Bligh locker are sticky bombs. Behind the C. Ahab locker are night vision goggles. Behind the D. Jones locker is a secret passage to the girl's room. Behind the C. Hook locker is a Guardian Head.

Hit the switch next to the girl's bed to exit. Head to the room in front of you.

Go through the double doors to your right. Kill the female ninjas. The torpedoes cannot be detonated.

Behind the phone, near the radar system control computers, you'll find the YELLOW KEYCARD.

Make your way back to the yellow key door (on your way back, take the right path and keep going until you see an opening on the left). Use the YELLOW KEYCARD to open it.

When you try to step on the teleporter, it will have no power. Head through the door to the power room, kill all female ninjas. Hit the switch below the Atomic symbol to restore power.

Go through the teleporter. You'll be transported to a small room with a switch.

Hit the switch. Lights will turn on in the distance, and a door will open.

Make your way back underwater and swim to the lights. A huge fan will blow you underwater on the other side. Surface quickly to avoid drowning.

Head for the burned place to end the level.