Vintage D&D Module The Land Between the Magic Mirror
The Land Beyond the Magic Mirror (EX2) is an adventure module, written for use with the first edition Advanced Dungeons & Dragons roleplaying game. It is set in the World of Greyhawk campaign setting.
In this module, the player characters plummet into a strange partial plane. They meet the Jabberwock, the Bandersnatch, and the Walrus and the Carpenter, and become involved in a giant game of chess.