Yeah there’s a phrase you’re supposed to look out for which lets you skip forward to a sekrit outcome, and in an earlier version it’s not there. Drove 12 year old me insane trying to get out of that dungeon.
Looking through the catalogue and based upon my vague memories of them, I think
25 - Beneath Nightmare Castle
36 - Armies of Death
19 - Demons of the Deep
15 - The Rings of Kether
Would be decent contenders for this sort of group format. Although doing one of the stark raving bonkers ones, like 42 - Black Vein Prophecy or 45 - Spectral Stalkers, would probably maintain interest.