 Livingstone stepped down as editor of the magazine after "White Dwarf" #74 (February 1986).In 1980, Livingstone and Jackson began to develop the concept of the "Fighting Fantasy" gamebook series, the first volume of which ("The Warlock of Firetop Mountain") was published in 1982 by Puffin Books.Livingstone and Jackson sold Games Workshop in 1991 for million.