I suggest zooming the image to see the detail better if the image is small on your screen.
The alterations I made are evident in the image. In other cases, the X occurs in each block affected. In some cases, an adjacent room is also affected, but because there is an object in that room, no X was placed directly in the room. In each place where an alteration was required to make that part accessible, I placed a red X in the square representing the room where the change occurs. The path that is black is the primary path from the beginning of the maze to its end. Next, I used a different color to indicate the alternate pathways as they occur in the maze. This way, the observer can compare before and after at the same time. The before changes image is on the left the after changes image is on the right. Then, I took the portion of the map that pertained only to the maze from each image, and placed them side-by-side. Then, once the changes were all done and I'd played through the entire maze, I made an image of the altered floor map. I made an image of the map before alterations were made. The image was created from two screen shots of the DOSbox window displaying the map images generated by MapEdit 8.4 of Episode 2, Floor 8. I documented the changes that were required in the form of a PNG image. It has probably already been done, but I don't care. I have taken the liberty of correcting the map for Wolfenstein 3D, Episode 2, Floor 8.
