From publisher blurb:
The stranger trying to sell his scroll is a fool! The Halls of Ogul-Duhr hold no mystery now. The old Gorgon was slain months ago and the caves have been picked clean of treasure. You have even heard that Orcs have moved in!
"Ah, to be sure, squire," the stranger agrees, grinning. "Ye foul creature is dead, 'tis true, but this map shows a SECRET entrance, to the Halls that lie BENEATH the upper caves of Ogul-Duhr! For there waits great wealth and magic!"
"Legends of Ogul-Duhr II: The Hidden Halls" is a free solo adventure written by Andy Holmes for all editions of Tunnels & Trolls. It is suitable for beginner characters with no more than 30 combat adds, though magic-users may find their powers restricted by the eldritch nature of the caves.