A's TEST Server is an original story taking place in the Digital Devil Saga series. It begins when the protagonist Serph awakens in an enormous tower with no memories. The player takes on the role of Serph as he attempts to find out what happened to his memories. The game uses a press-turn system and is similar to how it functioned in the original game with some slight changes. Due to its size, some phones necessitated the use of an SD memory card.