 "Polyhedron", the monthly membership publication of the Role-Playing Game Association, was combined with "Dungeon" into a single magazine beginning with Issue 90 (January 2002) and lasting until Issue 111 (June 2004).Many of the "Polyhedron" sections presented complete mini-games for the d20 system in genres other than fantasy.Editor Erik Mona changed the format in September 2004, starting with Issue 114, discontinuing the "Polyhedron" component and focusing solely on "Dungeons & Dragons".