Metal Gear Online is a dedicated online title released with Metal Gear Solid 4: Guns of the Patriots, an exclusive title for PS3, which took the market by storm on its release in June. Featuring characters, weaponry and levels taken from and inspired by Metal Gear Solid 4, Metal Gear Online allows up to 16 people to play simultaneously. The online game retains the famed stealth combat gameplay of the Metal Gear series, players are dropped in a series of war zones wherein different challenges await.

Konami announced that Metal Gear Online will be shutting down in severl faces. Starting late April you will not longer be able to crease new characters, while on May 21st the online shop will shut down, and finally on June 21, 2011, the game client will be disabled.