Stealth

To a new player, using stealth in OP-2 might seem unfeasible as most NPCs have significantly better senses than in vanilla SoC. However, it's not only feasible in certain situations, but also required for some quests, like Low-key hunting or Cat and mouse.

## Footsteps

The audible range of your footsteps depends on your movement mode, fully crouched being the most silent, and sprinting the loudest.

Two suits in the game make your footsteps **completely** silent, even when sprinting: Hunting Trenchcoat (can be bought from Sidorovich) and Armored Sunrise suit (obtained in Crazy doctor). Both suits help stealth missions immensely, as you can easily sneak up to enemies as long as you aren't in their view cone.

Keep in mind that you still make noise by disturbing the foliage or doing basic things like reloading weapons or opening the inventory.

## Silent jumping

Somewhat a physics exploit, this trick allows you to move silently in any suit, at the cost of being awkward and slow. Jump while standing still, and only press direction keys while in the air. Strafing sideways lets you move in the air a bit faster than forward or backward.

## Gun suppressors

At the first glance, suppressors do very little. But if you actually try a full stealth attack in a large fight, you will notice that NPCs get confused *a lot* when you can't be heard firing. Combined with silent footsteps, it can completely change how fights look.

These guns are the most silent:

* actually silent weapons like crossbows and Needlegun (audible range is zero)
* anything in 9x18mm with a suppressor (audible range is about 7-10m)
* anything in 9x39mm with a suppressor (about 25-40m)

## Light

Light level means nothing to NPCs. Their night sight is as good as during the day.

Flashlight increases the range of being spotted, regardless of the time of day or light level. However, NPCs don't see the light spot, so you can use the flashlight unless you're in the direct view cone of an NPC.

## Psi enemies

Certain enemies like Burers or Controllers can sense you telepathically without seeing or hearing you. They don't know exactly where you are, though. They can also alert ordinary enemies, and in that case they sometimes *will* know your last position at the moment when a telepathic mutant sensed your presence.

## Cloaking exoskeleton

You can use the Cloaking exoskeleton to sneak. It doesn't hide your footsteps, however. It can be obtained for Controller's brains quest by Lukash inside the Sarcophagus stash, along with the High capacity battery required for it to function. This battery can only be recharged with the Portable battery charger.

## Loading bug

There's a bug in X-Ray engine that seriously gimps stealth in the game. When you load your savegame, your gun makes the drawing sound inaudible to you but audible to every NPC in the online range. It doesn't always trigger, but when it does, everybody instantly "sees" you. The only guaranteed way to not trigger it is to not have any gun in your current slot when saving.

However this bug can be useful to lure normally camping enemies to you and drive them through a chokepoint, for example in The stash of Cross, or to reset the enemies that are stuck due do an AI quirk, such as invisible Monolith snipers in Akill's At gunpoint mission.