Metal Gear Solid: Portable Ops, officially abbreviated MPO, is a 2006 action-adventure stealth video game developed by Kojima Productions and published by Konami for the PlayStation Portable. The game was directed by Masahiro Yamamoto and written by Gakuto Mikumo, with series creator Hideo Kojima acting as producer. While not the first Metal Gear game for the PSP, unlike the previously released Metal Gear Acid and its sequel, as well as the Metal Gear Solid: Digital Graphic Novel, it retains the action-based play mechanics from the mainline series. Set in 1970, six years after the events of Metal Gear Solid 3: Snake Eater, the game follows the exploits of Naked Snake after he finds himself captured in Colombia by the now renegade FOX unit.