Metal Gear Acid(Japanese:メタルギア アシッドHepburn:Metaru Gia Ashiddo, commonly abbreviated as MGA) is a turn-based collectible card video game developed by Konami Computer Entertainment Japan for the PlayStation Portable handheld game console. The game was first unveiled at E³ 2004 in May, and was released in Japan on December 16, 2004, in North America on March 22, 2005 and in Europe on September 1, 2005. It was the first game in the Metal Gear series for the PSP.