Big Fish Games and Glu Mobile have announced a spin-off of the Mystery Case Files series for mobile phones, called Agent X. The game will transplant the familiar seek-and-find experience to the mobile phone, letting players take on the role of detectives solving mysteries by finding hidden clues. The game will also include weekly updates that provide a steady stream of new content, and a leaderboard where users can post and compare high scores. Agent X launches today on carriers across North America. Click here for more information and screenshots.