999: The Novel is an adventure game developed by Spike Chunsoft and released on iOS. The game is a thrilling choose your own path story from acclaimed writer Kotaro Uchikoshi  that takes readers on a suspense-filled journey full of danger, terrifying choices and unexpected twists toward a variety of endings that may or may not see them coming out alive on the other side.

999: Nine Hours, Nine Persons, Nine Doors is an adventure game developed by Spike and released on Nintendo DS.