Due to the 2011 Tōhoku earthquake and tsunami , the official servers that host the additional content and NetVocaloid services were taken offline in order to conserve power . They eventually returned online . However , the NetVocaloid services was discontinued on February 28 , 2012 , while the rest of the downloadable content was discontinued on September 30 , 2013 . The DLC for the PSP version have since been preserved through third-party websites
2011 Tōhoku earthquake and tsunami
2011 Tōhoku earthquake and tsunami
Metal Gear Solid: Peace Walker