The secret rooms are like any other room except they are accessed by a "secret passage" (not really a door). There are certain wall panels which can be pushed. The wall will then slide back revealing a passage to another room. Secret rooms are usually used to store treasure, keys, food, first aid and ammo packs and more powerful guns. Although there are no strict guidelines to where a secret room might be, there are subtle hints on where one might be positioned. Since the maps in the game are true (i.e. they are not warped space), a block of wall which is thick and houses no standard rooms (operated by normal sliding doors) could potentially house a secret room. First try the obvious places on the walls (e.g. Hitler paintings, Nazi banners and other obvious wall decorations). Some secret panels are in the corners of a room, others in the middle of a wall (midpoint of a wall in a standard room). There are also a few between two objects, such as two plants or two barrels positioned against the walls. Secret panels may also be found on walls in straight line extending from an object (such as an overhead lamp). Some secret rooms have secret rooms within them. Sometimes secret movable panels can be moved to block each other.