I posted something a few days ago about puzzle difficulty. Here is the puzzle I was thinking about:
You go into a room with 5 rows of 5 flags hanging from the ceiling. The flags are all of different colors. Some one color, Black, white, all the colors of the rainbow, and some are patterned. Choosing the right flag leads to success in your objective. Pulling the wrong flag creates a consequence. Pit suddenly opening, a creature appearing or the like. The only clue is... "Who is Robert?"
Which flag do you choose?