When you start in the hall, there are several elevators which are jammed, and one elevator that is locked. There is a room with a Flamethrower Nazi. Kill him and take the gold key. Now, look for an elevator that has a skeleton in it. There is a secret pushwall in that elevator.

Search through the maze and look for a hall with a sign at the end which reads "Eintritt Verboten!" The sign is a pushwall. Go into the room and find another pushwall sign. It should lead to another maze. Search through that maze until you find the locked door, which uses the gold key you have.

There you will find the silver key and a few more secret pushwalls. After going through the pushwalls you will be back near the elevator area, but you now have the silver key. MAKE SURE YOU SAVE YOUR GAME before opening the locked door.

In the next area are 2 Chaingun Soldiers, many Nazi scientists, tons of mutants, and Dr. Schabbs himself! Once you kill Schabbs, he drops the elevator key. Grab it, go through the locked elevator, and get out of there! You will have completed level 10.

There are other challenging levels, but there aren't any more that are as confusing as this one.

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