Digital Devil Saga: Avatar Tuner: A's TEST Server

Digital Devil Saga: Avatar Tuner: A's TEST Server (デジタル・デビル・サーガ アバタール・チューナー A's TEST Server) is an RPG released for Japanese feature phones as a side-story taking place in the Digital Devil Saga series.

After its initial release, it was released as Digital Devil Saga: Avatar Tuner: A's TEST Server Complete Edition (DIGITAL DEVIL SAGA アバタール・チューナー A's TEST Server 完全版). Only the Megaten α release listed it with this title. Other releases just used the original name on the complete edition release. The complete edition included an ending beyond the fifteenth floor and the character Heat, who didn't appear in the original version. This version also added vendors to buy and sell items as well as recovery terminals.

Because the game was released as a Mega i-appli (メガiアプリ) application, some phones required an external SD card to store the game.

Plot
The game begins when the protagonist Serph awakens in an enormous tower, entitled the Karma Tower with no memories. The player takes on the role of Serph as he attempts to find out what happened to his memories. Later on, Serph meets with Argilla, Heat and Sera. Gale and Cielo do not make any appearances in the game outside of being briefly mentioned, however the game shows other members of the Embryon being present in the tower. At certain points, the player encounters a number of bosses (Including Genbu, Byakko and Seiryu).

At an elevation of 66,666 meters, the group reach the top of the tower and encounter the final boss of A's Test Server, who is revealed to be Serph Sheffield, wearing a tuxedo and a bow-tie as per a description included in the novella That's Catch 22. In dialogue he is referred to as Count Baal (バアル伯爵), and he intends to take Sera as his bride and prevent her from escaping the tower, forcing the group to battle him. He transforms into Beelzebub for the final boss fight. It is not known whether Sheffield's inclusion is exclusive to the complete edition of the game.

Characters

 * Serph: Protagonist
 * Argilla: Party member
 * Heat: Party member (Complete edition only)
 * Sera: Major character
 * Serph Sheffield: Antagonist

Gameplay
Exploration and battles take place in a 3D environment designed to mirror the original games as much as possible. Battles make use of a press-turn system similar to that of the original games with some slight changes.

The game includes a Mantra system much alike the original games, taking the form of a hexagonal grid. Most of the mantras included are almost identical to those of the original games, however due to the limitations of the cellphone platform some are omitted.

Trivia

 * At an earlier stage of development, the game was announced as Digital Devil Saga: Avatar Tuner for Mobile, before later being changed to the final title.