How about a room somewhere where you can go to practice puzzles (Reaver, 5x5, inspired quarter 3D tile puzzle, etc.). I know there are solvers everywhere, but the ultimate goal should be that most people can do most puzzles on their own. Sure, a person could go pull up the Mastermind web game, but how about a place in game where they can twirl the actual skulls without eles and a timer ticking down, or a place to practice jumping on to the middle tile without stepping on three others.
Or am I carzy for picturing a day when no one needs to be let out of a room in part three?