 Of these, X1 – "Isle of Dread" was one of the most widely played modules of the time because it was distributed inside the D&D "Expert Set" rules.Other Moldvay adventure modules for D&D include "The Lost City" (1982) and "Twilight Calling" (1986).In the years between 1980 and 1988, he also penned several articles in "Dragon" magazine.