I'm making games and puzzles now. Must be one of those days.
I'm a huge fan of the MIT Mystery Hunt puzzles. You see, every year, students of the Massachussetts Institute of Technology run a 72-hour, non-stop puzzle marathon where all participants compete for the mere privilege of hosting the next year's contest. Don't take my word for it if I make it sound mundane - the puzzles are some of the most difficult things you'll ever see in your life, and every year tends to be more creative than the last.
Aside from being more difficult than their more conventional counterparts, the MIT Mystery Hunt puzzles operate on a "metapuzzle"-type arrangement. That is to say, puzzles are grouped into categories, and all the solutions for a certain category will collectively make up one last "metapuzzle" that gives the final answer. Get that final answer somehow, and you count yourself among an elite circle of solvers.
If you still don't understand how it works, maybe it's best that I show you by means of example.
I've enclosed a miniature version of the Mystery Hunt below. The solution to each puzzle is a legible word or phrase, and when put together, should be able to clue you in on a final answer. I've purposely laid everything out in a manner similar to the Mystery Hunt puzzles, but I've tried to tone the difficulty down a bit so you don't end up tearing your hair out.
Now, let us begin...
Quincy took a long drag on his cigarette. "So, who dis guy again?"
"I don't know. We might have to find that out ourselves."
"Peh," Quincy spat. "We ain't gonna get nobody if we don't know who he is."
"We'll find out," I told him. "We've got a few leads already."
Apollo Street Theater
[Edit: A copy of the Greek alphabet might come in handy. It'll be useful for bringing about some form of order to the Apollo Street Theater puzzle, and that's saying plenty already.]