This is a good book. It's got the immediately likeable trait that you could run it with just this book, ready-made characters are included within, and damagge and armour rolls are provided for for monsters and heroes alike.
Obviously a copy of the AFF rulebook would be needed if you wished to be a spellcaster, and you'd need a copy of Out of the Pit, if you want to use the random encounters effectively, but otherwise it stands on its own two feet (though the warlock himself might be a challenge to run).
The adventure doesn't deviate very much from the original gamebook, but it stil seems to work.
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