Metal Gear Solid 3: Subsistence was released in Japan on December 22, 2005, later in North America on March 14, 2006, in Europe on October 6, 2006, and in Australia on October 13, 2006. Subsistence continues the Metal Gear Solid series tradition of follow-up expanded versions. While previous releases, such as Metal Gear Solid: Integral and Metal Gear Solid 2: Substance included skill challenge missions and/or side story missions, Subsistence eschews the extra single-player missions to include ports of the MSX2 version of the original Metal Gear and its sequel Metal Gear 2: Solid Snake (with the latter being officially localized for the first time); Metal Gear Online, an online multiplayer component; and a fully 3D, user-controlled camera in the main portion of the game. Because of all the additional content that was added, the Subsistence edition was split into two discs: the first disc contains the main game only (including the cutscenes viewer), while the second disc features the online multiplayer mode and all the other supplemental content.