[2] The book contains a special section to simplify running the final encounter, including game statistics for weapons, equipment, and non-player characters for the Nazis.
[2] The Keep was written by Daniel Greenberg, Samuel Shirley, Gregory Maples, and Anne Jaffe, and was published by Mayfair Games in 1984 as a 40-page book.
The extraordinary complexity of the storyline which spans eons of struggle against forces of evil makes playing The Keep an ordeal even for the most experienced GM and a near impossibility to the novice.
"[2] Swan commented that "It's not often a fantasy roleplayer gets a chance to take on the Third Reich, and the uniqueness of the setting makes it a very satisfying encounter for players and GM alike [...] In spite of the incongruity, the Nazis work surprisingly well; GMs unwilling to tackle the entirety of The Keep might consider lifting this section for use in another campaign.
Assuming the GM is able to get a handle on the storyline (which will require several readings of the module along with a strong imagination to fill in the blanks), there are literally dozens of characters to keep track of through changes in identity, personality, and actions.