How many stages has wolfenstein 3d

There are nine stages each in each of the six episodes of Wolfenstein 3D. ..In order to advance to the next stage, you must find the two keys (one gold, one silver) which are hidden in 2 separate rooms. ..The keys can be hidden anyplace, anywhere; so check each and every room, and don't forget to collect all the treasures ..Also look and feel along the walls, as there are secret hidden rooms in each stage. .. In all, there are 54 stages in Wolfenstein 3D ( 9 x 6 = 54 ).