About

The game was officially unveiled in Kojima Productions' 20th Anniversary Party of the Metal Gear series. While Metal Gear Solid 3: Subsistence and Metal Gear Solid: Portable Ops featured optional online game modes that were both dubbed "Metal Gear Online", this incarnation of the online game was initially announced as a separate standalone product based on the Metal Gear Solid 4: Guns of the Patriots gameplay and setting. However, it was later announced as being a part of Metal Gear Solid 4. A standalone version was released in Japan on July 17, 2008.

On June 12, 2012, the servers for Metal Gear Online 2 were shut down, although fan servers have been created.