Has puzzle that requires PC to ask the GM for "check to bypass".
Has Riddle that is important to not fail.
Scenario splits the party.
Once split, making it back requires complicated puzzle or randomly going through portals to make it back.
NPC tells you your object is fake, but since the entire party was so frustrated with the entire thing we didn't remember the path we didn't go so lost prestige.
So having one {Puzzle, Riddle, Forced Party Split, or a Prestige tied to fake item} is fine. Having 4 is in my view the worse scenario I've played.