Metal Slug XX

 is a run 'n' gun game developed by SNK Playmore and published by Atlus on December 23, 2009 in Japan, on February 23, 2010 in North America and on June 25, 2010 in Europe for the Sony PSP. The game featured a downloadable additional character, but with the shut down of the PSP frontend online shop they can no longer be obtained on the original console.