Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Metal Gear Solid: Portable Ops (commonly abbreviated to MPO) is a stealth game directed by Masahiro Yamamoto and written by Gakuto Mikumo, with series creator Hideo Kojima acting as a producer. Portable Ops was developed by Kojima Productions and published by Konami in 2006 for the PlayStation Portable. It is the fourth Metal Gear title for the PSP and the first one to retain the series'' action-based gameplay. It is also the first canonical outing of the Metal Gear Solid series for a portable platform, following the storyline of Metal Gear Solid 3: Snake Eater.