The Land Beyond the Magic Mirror: Advanced Dungeons and Dragons Fantasy Adventure Module by E. Gary Gygax.
Publisher: TSR Hobbies Inc. (1983). 32-page booklet with an outer folder.
In this D&D module, the players can meet the Jabberwock, JubJub bird, Bandersnatch, and the Walrus and the Carpenter, and get involved in a giant game of chess. The White Knight becomes an iron golem riding an iron horse, and Tweedledee and Tweedledum are renamed T. Deeous and T. Diumm.