Some time later, Dr. Wily claims to have changed and teams up with Dr. Light to create a giant peacekeeping robot called Gamma. However, the new Robot Masters created to mine the Energy Elements needed for Gamma's construction have gone out of control. Mega Man goes after them, meeting his brother, Proto Man (under the alias Break Man in this game, until the ending) along the way. Mega Man soon retrieves the crystals, but returns to discover that Dr. Wily has stolen Gamma and plans on using it to take over the world.
Three main installments, as well as one online game, were published for the PlayStation 2 (PS2). Final Fantasy X (2001) introduced full 3D areas and voice acting to the series, and was the first to spawn a direct video game sequel (Final Fantasy X-2, published in 2003). The first massively multiplayer online role-playing game (MMORPG) in the series, Final Fantasy XI, was released on the PS2 and PC in 2002, and later on the Xbox 360. It introduced real-time battles instead of random encounters. Final Fantasy XII, published in 2006, also includes real-time battles in large, interconnected playfields. The game is also the first in the main series to utilize a world used in a previous game, namely the land of Ivalice, which had previously featured in Final Fantasy Tactics and Vagrant Story.