Retroclones and Older D&D Editions There are many out there who enjoy the style and feel of older editions of D&D. While it's certainly possible to find these products on eBay and the like, you may not be aware of the concept of a retroclone. A retroclone is a game that is compatible with, and heavily based on, an unsupported game or unsupported edition of a game.
Originally posted by TSR employee Mike Breault on Knights & Knaves Alehouse (link no longer exists; recovered via Wayback Machine and archived here): OK, so here goes. I'm going to add new tidbits as I have time and think of them, but here are a few to start. Keep in mind that except where I say I witnessed things or was told them by Lorraine, these are essentially rumors (but fun nonetheless).