NETRICSA is a personal computer that was embedded into Sam's skull sometime before the series began. NETRICSA allows him to retrieve information about subjects such as enemies and weapons. Later versions are also able to analyze locations the user is in and give tips regarding where the user is. It also helps Sam by overlaying a HUD over his eyes, which shows a crosshair showing where Sam's bullets and projectiles will hit a target, the amount of ammo he has for each of his weapons, and the amount of armor and health he has.

200~ lines using an robotic filter would work best.

NETRICSA will automatically update Sam about new information when he encounters a subject for the first time. For example, when he picks up a M1A2 Thompson, NETRICSA will update itself to show off data for the M1A2 Thompson. Also, if Sam kills an enemy type for the first time, NETRICSA will also update itself with data on the subject Sam just killed.

Gameplay-wise, NETRICSA will show the player's statistics, such as enemies killed, time in a level and secrets found.