There are plenty here that enjoy a puzzle mystery hunt.
At the normally inane quiz/trivia website Sporcle, they've put together a rather good little mystery hunt. http://www.sporcle.com/blog/2015/09/siapuzzlehunt/
Each of the 10 rounds is a standalone puzzle, with a meta answer (that can be checked here).
Round 10 is easily the hardest to deduce the meta answer for, if you just want to pick one to do.
All 10 meta answers are required for whatever will be released on Tuesday.