Seppuku Station

Start out by killing the Evil Ninja.

Jump down onto the street. Kill the two ninjas roaming around. Remember you can pick up your used shurikens after you throw them by approaching them and hitting the space bar. It may be necessary to jump or crouch to retrieve it.

Take the uzi on the flatbed of the white truck. 

Next, grab the med kits and clips lying around. Behind the crashed bus is a gas grenade.

Walk down into the underground tunnel across from the white truck.

Kill the ninjas. It may be a good idea to toss a gas grenade into an area where there's a group of ninjas.

Take the gold key on the highest crate in the corner.

Next, walk along the small ledge and enter the black window. Hit the button on the desk to reveal some ammo and a med kit behind the map on the wall.

Now go to the door with the golden keyhole next to it. It's located near the crashed bus on the street level.

Enter the room and kill the ninjas. Watch out for the one crouching behind the desk. The best way to get to him is to crouch and run behind the desk. Waiting for him to pop up will allow him to do serious damage.
 
Jump up through the window above the couch and take the riot gun.

Return to the previous room and crawl into the next room through the luggage carrier.

Take out the ninja from the luggage carrier and then drop into the room. Take the armor vest and ammo. Activate the panel on the wall to get the missile launcher.

Find the console on the wall next to the panel where you got the missile launcher. Use the arrow keys to control the motorized car, and drive it through the slot in the upper left corner of the screen.

Walk down into the underground tunnel across from the white truck.

Kill the ninjas. It may be a good idea to toss a gas grenade into an area where there's a group of ninjas.

Ride the other luggage carrier into the next room and clear it out

Now return to the room you first came in and enter the doors on the far right side.

In the pool is a school of hungry fish with sharp teeth. If you are feeling brave, jump in and take the supplies.

Enter the next room with 3 doors and lockers. Clear the room, and remember to stay away from the coolie after you kill him because you may have to deal with his ghost.

Leave the secret room and go down the hall to the room with the machines. Grab the silver key from the small car next to the machines. You can activate the Godzilla poster for some shells.

Return to the room with the 3 doors and use the silver key on the keyhole.

Enter the small room and pull the lever. Grab the night vision glasses and use them to see the shadow ninja outside. It is best to kill him from here.

Walk back out and enter the door to the left of silver keyhole.

Clear the room and activate the red sign to get the card for the stinger missiles. You will also find a riot gun
behind the large map on the wall.

Now run onto the empty tracks and walk along the ledge. Use the heat seeking missiles to destroy the turret ahead, and take out anything left alive in the room

Walk into the train; kill the coolies, and their ghosts.

Activate the yin yang symbol to leave the level.