The first part of Death Note Shinsekai e no Izanai (Death Note Invitation to a New World) launched on April 12th 2014 for devices running iOS or Android. With the second, third and fourth parts coming in staggered releases at the end of April, middle of May and the end of that month respectively.
The Death Note Smartphone App is currently only available in Japanese.
Players will find themselves inside a locked room, from which they need to escape. This involves following clues, deactivating/bypassing traps and solving puzzles in order to unlock the door.
It's been created as part of Death Note's 10th Anniversary celebrations. Anyone downloading it as we speak?