A number of scenes were changed between the early prototype and the final release. For example, in the mausoleum section there were originally no skulls jumping out at Dirk, and no skeletal hand trying to grab him. He simply walked down the corridor, but could be directed to exit through any of the doors to the left or right, with some containing Crypt Creeps. He could also exit through the door at the end of the corridor, which is inaccessible in the final version.