In this November 4, 2004 New York Times article Noah Shachtman discusses the strong appeal of Halo 2's viral marketing experience called "I Love Bees".  In it, internet users followed clues and solved puzzles to locations across the United States to gain access to a 10 hour audio drama (now located at ilovebees.com/humptydumpty.html).  The interactive element of the game increased with time, and listeners could have live conversations with "Melissa", an enigmatic character in the drama, after successfully solving some puzzles.