Over at Mazuma Hunt we just recently started a new series of Virtual Hunts where everyone can participate.

In the new Virtual Hunts there is a Master Quarry that you must identify by solving a series of twenty “clues”, that include a wide range of challenges, such as hardcore sudoku puzzles, complex mathematical series, and cryptographs. Mazuma Hunters need a wide range of puzzle-solving skills to win.
To be a victorious Hunter you must not only identify the Master Quarry, but must also solve the five or six Key Clues. In fact, until all Key Clues are solved you cannot attempt to identify the Master Quarry.
Take a look at MazumaHunt.com