Codename (gameplay)

In the Metal Gear series, a codename or title is awarded to the player upon completion of each game, often based on certain gameplay statistics. Originally introduced in Metal Gear Solid, this feature was also included in the re-released version of the earlier games.

Metal Gear
The requirements are fairly simple in that it only requires a specific time to finish the game, which in itself is divided into how long it takes to defeat each boss.

A codename is also awarded for completion of the Boss Survival mode.

Boss survival mode

Metal Gear Solid 2: Sons of Liberty
There are several gameplay statistics that determine which codename is awarded to the player. Early versions of the game also awarded the player with a clear code that could be submitted to the game's official website, recording these statistics on a leader board for each geographical region.

Metal Gear Solid: Peace Walker
Because of various gameplay changes in Peace Walker, codenames, unlike previous games, do not require the completion of a playthrough to gain it. Instead, it only requires beating various missions a number of times. Likewise, the requirements for gameplay have been reduced to the types of weapons used to defeat enemies, the player mode it was done in, and whether the use was lethal or non-lethal for the most part. In addition, insignias are issued for the various tasks involving the (lack of) use of recovery items, (not) triggering an alert, among others.

Metal Gear Rising: Revengeance
Although not Codenames, a similar ranking system is utilized in Metal Gear Rising: Revengeance, which can be accomplished by completing certain objectives.