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In page Ian Livingstone:

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In 1982, Jackson and Livingstone co-wrote The Warlock of Firetop Mountain, the first book in the Fighting Fantasy series,[1] but following an instruction from publishers Penguin to write more books "as quickly as possible" the pair wrote subsequent books separately.[citation needed] The series had sold over 18 million copies as of 2017,[2] with Livingstone's Deathtrap Dungeon selling over 350,000 copies in its first year alone.[3] Livingstone wrote another twelve Fighting Fantasy gamebooks, including The Forest of Doom, City of Thieves and Caverns of the Snow Witch before marking the 30th anniversary of The Warlock of Firetop Mountain with a new gamebook, Blood of the Zombies, in 2012,[4] and with The Port of Peril in 2017 for the 35th anniversary.[2]