KONAMI

Enemy Alert Levels

Alert Level Differences

Should Snake enter the enemy's visual range (seen right) during Infiltration mode or perform some other action that gets him spotted, the Alert Level will change.
  • Infiltration Mode
    Snake remains unnoticed by enemy soldiers and surveillance cameras in this mode.
  • Snake is spotted by an enemy
  • Alert Mode
    Snake has been spotted by an enemy soldier or surveillance camera.
  • Once the enemy has lost sight of Snake,
    a counter will begin and the Alert Level
    will be lowered to Evasion Mode.
    Spotted by an enemy
  • Evasion Mode
    Enemy soldiers continue to search for Snake outside of their usual patrol paths.
  • Counter reaches zero
  • Back to Infiltration Mode...

Enemy Activity During the Infiltration Mode

In the Infiltration Mode, enemy soldiers patrol specific paths. They conduct visual and auditory sweeps of their patrol routes, looking for anything out of the ordinary.
Enemy sentries in the Infiltration Mode will leave their rounds to investigate whenever they hear a noise. This contingency is referred to as the "Noise Mode." When they are satisfied that the area is clear, the sentries return to their patrol routes. It is possible to intentionally make noise to decoy a sentry away from his post.

Enemy Activity During the Evasion Mode

The Alert Level will be escalated to Alert Mode if Snake is spotted during Evasion Mode. If Snake can evade the enemy until the counter displayed above the radar reaches zero, the Alert Level will change to Infiltration Mode, and enemy units will return to their usual routes.

Enemy Activity During the Alert Mode

In the Alert Mode, sentries will call for backup and launch an offensive against Snake. Once Snake has shaken off their pursuit, the Evasion Mode will begin.
The "Noise Mode" is not available when in Alert Mode.