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Blizzard Pass is a solo adventure for a thief level 1–3. The thief must cross Blizzard Pass, and then penetrate a cavern system within Blizzard Pass to free the other adventurers from a prison. The module also contains a short adventure for a party of characters level 2–3, dealing with the exploration of the Pass.
Blizzard Pass was written by David Cook and published in 1983. Module M1 consisted of a 32-page booklet with an "invisible ink" pen attached to its outer folder and featured a cover by Tim Truman. Blizzard Pass is designed for use with the Basic Rules. Hidden messages written in invisible ink are placed throughout the module in blank boxes. The module comes with a special pen which, when rubbed over a box, reveals the hidden message. The module has a total of 309 entries, nearly half of which are blank and need to be made visible. The 10th Anniversary Dungeons & Dragons Collector's Set boxed set, published by TSR in 1984, included the rulebooks from the Basic, Expert, and Companion sets; modules AC2, AC3, B1, B2, and M1, Blizzard Pass; Player Character Record Sheets; and dice; this set was limited to 1,000 copies, and was sold by mail and at GenCon 17. In 1985, TSR published Into the Maelstrom and assigned it the module code M1. To avoid confusion, Blizzard Pass was retroactively assigned the code MSOLO1.