Metal Gear Online happened in 2008.
Metal Gear Solid 4: Guns of the Patriots has an online component called "Metal Gear Online". Metal Gear Solid 3 also had MGO with MGS3 Subsistence, but currently is not online.
Metal Gear Online was created on 2008-06-12.
There is an online component in MGS4 called Metal Gear Online.
Metal Gear Arcade happened in 2010.
Metal Gear Solid happened in 1998.
Metal Gear Acid happened in 2004.
You have to buy it from the Metal Gear Online Store.
Metal Gear Acid Mobile happened in 2008.
Metal Gear Solid Mobile happened in 2008.
Metal Gear Solid Touch happened in 2009.
chances are problaby not, there will be an Metal Gear Online though
Metal Gear Solid HD Collection happened in 360.