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 versions 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 2: Solid Snake
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 4: Guns of the Patriots
Unlike prior games, the codenames earned can actually be viewed on a window menu in-game.

Metal Gear Solid: Peace Walker
Unlike previous games, codenames in Peace Walker are awarded after completing various missions a certain number of times, rather than playing through the entire game. Similarly, the gameplay requirements have been reduced to the weapon types used, the player mode, 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
The following is unlocked when the player achieves certain requirements.