Episode 4, Floor 4 is a fourth level of Wolfenstein 3D episode "A Dark Secret". It is quite confusing because of the number of doors. To make things worse, some guards wander through these doors, making easy for them to shoot you from behind. Apart from that, this floor is not as hard as most of Episode 4 maps. Most of the level presents brown wooden walls, except for a little maze on the eastern side of the map which has jagged brown rock walls.