As the name suggests, Metal Gear Online will be a multiplayer title, that will cater for up to 16 players online. The player can upgrade skills, such as hacking, CQC mastery, tomfoolery, enhanced lock-on, and more, all of which can be leveled up; you can also keep tabs on allies and enemies with nanomachines.

Players will have the ability to "hack" another player's character to steal information from their nanomachines, such as the locations of his/her allies.

A successful beta test for Metal Gear Online has recently ended in Japan and the game is expected to make its debut the first quarter of 2008.