Xenosaga Episode I: Der Wille zur Macht is a role-playing video game developed by Monolith Soft and published by Namco for the PlayStation 2; the game was released in 2002 in Japan and 2003 in North America. It is the first entry in the "Xenosaga" trilogy, and forms part of the wider "Xeno" metaseries. Gameplay features exploration of environments through a linear narrative, while battles use turn-based combat with the player characters fighting both on foot and piloting large mecha dubbed A.G.W.S.; combat in turn features a system of button combinations for attack types, and multiple leveling systems.