The 2nd edition of AD&D sold well when it was released. Combined, the Dungeon Master’s Guide and Player’s Handbook sold over 400,000 copies in their first year. That’s a lot of books. Not the most ever sold by TSR, but a lot. To give some historical comparison, the 1981 D&D Basic Rules Set sold over 650,000 copies in its first year. To compare to previous editions of AD&D, the 1st edition DMG and PHB together sold over 146,000 copies in 1979. Putting those numbers together makes AD&D 2nd edition look like a solid hit. But it hides a deeper problem.