After the release of the AD&D game, the Basic Set saw a major revision in 1981 by editor Tom Moldvay. The revised version of the set included a larger, sixty-four page rule book with a red border and a color cover by Erol Otus, the module B2 The Keep on the Borderlands, six polyhedral dice, and a marking crayon.
This version is commonly known as the Moldvay edition.