Games Workshop. Any rule book that is not a part of the core rule books, even if it ultimately comes from the original publishers of the game, could be seen as being house rules. Legal aspects In a United States law case. Lefkowitz v. Great Minneapolis Surplus Store, Inc (1957), Great Minneapolis Surplus Store advertised some fur coats for sale for $1 each, "first come first served", then argued (unsuccessfully) that they had a "house rule" stating that bargains were limited to women only. The Supreme Court of Minnesota readily disposed of the store's argument: References Game design Game variants