Shin Megami Tensei: 20XX Devil's Colosseum (真・女神転生 デビルコロシアム 20XX?) is a cell phone game created as a prequel to Shin Megami Tensei: 20XX. The game tells the history of the Hero before the events of the previous game.
- Japan: April 28th, 2008 (S! Apps)
The game uses the Elemental-Based Combat System, but the races of demons were renamed by their combat type, e.g. "Brutes" (妖鬼?) are instead called "Battlers" (戦人?), and the number of party members was reduced to 3. There are also new features that can be unlocked when starting a new game if the secret boss is defeated.
Two twins (a boy and a girl) are left by their parents in an orphanage called "Silent Night". They grow, and at 14 years old, the girl is possessed by a demon and throws the orphanage into a dark maze, full of monsters. After receiving a COMP by a mysterious man in a wheelchair, the boy travels to rescue his sister and save the orphanage.