Shin Megami Tensei: Digital Devil Saga 2, known in Japan as Digital Devil Saga: Avatar Tuner 2, is the direct sequel to Digital Devil Saga: Avatar Tuner, both for the PlayStation 2. In addition to an improved mantra grid, the game adds a "Karma Ring" system, allowing the player to increase character stats. By equipping these rings with gem stones found in the game the player can further increase a character's stats.