結果はアメリカで5万2000本 Peace Walker Sales Difficult To Judge - PlayStation Portable News at IGN http://psp.ign.com/articles/110/1106817p1.html Despite universal praise, Metal Gear Solid: Peace Walker, Konami's biggest PSP game of 2010, sold 52,000 copies in the United States after roughly four weeks of being on sale in June, according to NPD's latest data.