Objectives

Your objectives is to go near the biter's structures without being detected, destroy them and escape safely.

How to

This mod give you a new capacity: stealth.

you enter the stealth mode by striking a key (default SHIFT-R). In this mode, the biters don't attack you. You can exit the stealth mode by pressing the same key.
but, in the center of the screen your have two bars, the red bar is the "threat", the blue bar is the time you spend in stealth mode.
the threat increases when they are biters around you (more the biters are near, more the threat increases), or when you deal damage to biters (using <C> key)
if the threat reachs 100% (red bar full), you exit the stealth mode and return to normal mode. Now the biters attack you.
if you want to attack biter, your need a pistol with silencer. Any other weapon will make you exit the stealth mode.
if you shot a biter nest or a biter turret, you exit the stealth mode
some element of map will hide you (tree, rock, cliff). If they are near, the threat will decrease. A small green circle show you when you are protected.
if you kill biters, the remaining duration of the stealth mode increases (blue bar)
to destroy biter's structure, you may need time bomb, but don't stay too close when they explode
a capsule of cloud of smoke can create a cloud of smoke. The cloud will lower the threat when you are in.
when the stealth mode is in cooldown, your running speed is increased
when you enter the stealth mode, the aggro of the nearby biters is reset. But beware of the threat