The dog days of summer are a great time to relax with a gripping mystery. Better yet, why not help solve one? Today's launch of Professor Layton and the Diabolical Box for the Nintendo DS and Nintendo DSi systems presents players with more than 150 new brain-teasing riddles and puzzles to solve as they help Professor Layton and his apprentice, Luke, uncover the mystery surrounding the Elysian Box, which is said to be deadly to all who open it.