The first "Players Handbook" was released in June 1978 as a 128-page hardcover. It was written by Gary Gygax and edited by Mike Carr, who also wrote the foreword. The original cover art was by D.A. Trampier, who also provided interior illustrations along with David C. Sutherland III. In this edition, the game rules were divided between the "Players Handbook" and the "Dungeon Masters Guide", which was printed later. Later editions of the game moved the bulk of the game rules to the "Player's Handbook", leaving information needed chiefly by the DM in the "Dungeon Master's Guide". The new rules were so open-ended that game campaigns required a referee or Dungeon Master.