Mordenkainen's Fantastic Adventure by Robert J. Kuntz and Gary Gygax is an adventure module for the Dungeons & Dragons role-playing game, published by TSR, Inc. in 1984. It originally bore the code "WG5" and was intended for use with the Advanced Dungeons & Dragons first edition rules. Because it is one of the WG modules, it is a module intended for the World of Greyhawk campaign setting. It was later updated in 2004 to the Third Edition Revised rules in Dungeon magazine, issue #112, as Maure Castle. There were subsequently two additional installments in issues #124 and #139.