1. Directly in front of Dr. Hammerstein. Note: You cannot kill him in this episode. Without the full version of the game you cannot see the true ending. You must let him kill you to see the end of Episode 1. 2. You must destroy the Plasma Core to end the episode. 3. The exit is a mirror. Press SPACE (open door button) to end it as usual. 4. This puts you directly in front of Dr. Hammerstein.
Climb down all the stairs to reach this point. While climbing down each flight of stairs, check all the walls to find heath and ammo for all your weapons. Dr. Hammerstein is very powerful. He kills you in one hit when playing under the I'm Tough! Or Lets Party! difficulty settings. Be prepared to move fast. Using the Super Plasma Gun and the Magic Wand is recommended. Do not use the pistol since it fires too slowly and can leave you open.