Metal Gear Solid 4: Guns of the Patriots

Metal Gear Solid Database is an encyclopedia of the entire saga and catalogs every piece of Metal Gear in-game lore from all canonical entries in the series at the time of its release: Metal Gear, Metal Gear 2: Solid Snake, Metal Gear Solid, Metal Gear Solid 2: Sons of Liberty, Metal Gear Solid 3: Snake Eater, Metal Gear Solid: Portable Ops, and Metal Gear Solid 4: Guns of the Patriots. Data and files for Metal Gear Solid 4 are only unlocked after completion.

Metal Gear Online, commonly abbreviated MGO and also known as MGO2, was an online multiplayer spinoff of the Metal Gear series. 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.