Shin Megami Tensei J (真・女神転生-J) is a Shin Megami Tensei cellphone game designed for early Japanese feature phones. Due to this being developed by Atlus and not BBMF, it is likely that this is one of the first Megami Tensei mobile games.
The game consists of 3D dungeon exploration, similar to the earlier installments in the series. During this, the player encounters randomized battles with enemies, using a cut-down battle ui. The player is able to travel to different locations using a text-based UI, and view information using a menu stylized as "DDS-NET."