Level 11. Sumo Sky Palace

Start by taking down the Baby Ripper and Guardian in front of you, and the Brown Ninja shooting from the left window. The GOLD KEY is visible in the left window, and the silver key is in the right window.

Proceed forward to the gold key door, but you don't have the key yet. There is an opening to the right of the gold key door with items. You can also check the left side.

Go to the door across from the gold key door and proceed forward. Kill the ninja on the far side.

Go to the other end and hit the switch. The GOLD KEY behind you on the far side will lower, granting access. You must walk across the ledges without falling to get the GOLD KEY.

Pick up the smoke bomb and the GOLD KEY, then return to the gold key door.

Use the GOLD KEY on the gold key door and go through. Defeat the Serpent and the Ripper in the middle of the room.

Go to the other side of the room and take the left path. Kill the enemies there, jump up the crates. The door ahead is locked.

On the other side of the locked door, there are two switches. Hit the RIGHT one, then jump back down and go to the right path.

Jump up the crates again. Hit BOTH switches here to open the door.

Go through the door to the second floor. Go around and find the RED KEY in the middle, along with a grenade launcher.

Jump to get the RED KEY, then go back down to the first floor. Use the RED KEY on the red key door, which is to the west of the gold key door.

Go through the red key door and carefully navigate the spinning slicing thing using the safe spots.

On the other side, check the chair for ammo and deal with the Ninja. Go to where the ninja was to find a switch that bypasses the other spinning slicing thing.

Kill the remaining enemies and check the middle bookcase for a rail gun.

Go through the door ahead and kill the Coolie and the ninja.

Follow the path down the stairs into an area with Ripper and Coolie Ghosts. Kill them all.

Look around the room for bars, open them, and hit the switch inside. Rush through the door quickly before it closes.

Go down the ladder back outside. Go up, turn left, jump through, turn right, go up, and carefully jump to the ladder and climb up.

Save your game. Up the ladder, you will face a Guardian and firetraps.

Head down and find a small medikit. Jump on this platform and keep jumping up the platforms until you reach the other side where the SILVER KEY is.

Pick up the SILVER KEY and the missile launcher. Return to the firetrap room.

Use the SILVER KEY on the silver key door and go through.

Navigate the moving mechanism with spikes and open the door on the other side. Kill any ninjas shooting at you.

Jump from one moving column to another to reach the other side.

Once on the other side, open the picture of an old woman. Approach the lever slowly to avoid missiles from the corners of the room.

Hit the switch, then head back to the middle column. A teleporter will appear.

Go through the teleporter to fight the SUMO. Pick up ammo in the corners if needed.