Sneak "Sneak - Quiet movement, and the ability to remain unnoticed. If successful, you will be much harder to locate. You cannot run and sneak at the same time."

Sneak penalties

Sneak penalties now apply not in weight, but in volume of items in your inventory.

Groups of items

Groups and pentalties:

  • volume = 0, penalty = 0.2% - money, ammo (bullets and batteries), drugs (stimpaks, jet, mentats, buffout), other small items.
  • volume = 1, penalty = 4% - small knifes, knuckles, 40 mm grenades, grenades, SS, psycho, mantles, leather jacket.
  • volume = 2, penalty = 15% - wakizashi, spear, sledgehammer, rockets, power fist, cattle prod, leather armor.
  • volume = 3, penalty = 30% - pistols (not Gauss), Red Ryder, AP, Mega Power Fist, Supersledge, Super Cattle prod.
  • volume = 4, penalty = 50% - every small gun with an animation of Machine Guns, Gauss pistol, Energo pistols, Metall armor.
  • volume = 5, penalty = 100% - Every weapon with rifle animation (but Red Ryder), Energo rifles.
  • volume = 6, penalty = 150% Every heavy weapon with minigun\flamethrower animation, PA/APA/JUG.

Sneak formula

Character vision formula

(20 + (PE + A)*3)*Z

Sneak detection formula

(20 + (PE + A + B - C)*3))*Z - (Sneak+D)/6)



File:/static/wikien/images/thumb/9/91/Sneak.png/200px-Sneak.png



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Sneak spreadsheet




Minimum sneak-break distance is 3 hexes. With a Sharpshooter perk or having a movement sensor in your inventory its 6 hexes. (If you have both of those - 9 hexes.)

Sneak = sneak skill - all the penalties.

A=2 with the Sharpshooter perk and 0 without it. B=2 with a movement sensor turned on in your inventory, 0 without it. C=2 with a stealth-boy in sneakers inventory, 0 without it. These bonuses don't stack.

D=40 at night (21.00-4.59), D=20 at twilight (17.00-20.59 and 5.00-9.59) with the Ghost perk, D=0 without that perk.

Z considers the impact of time on character's perception:


  • Z = 1.2 when it is 9.00 - 16.59
  • Z = 1 when it is 17.00 - 20.59 and 5.00-9.59
  • Z = 0.8 when it is 21.00 - 4.59


For characters who have Night Vision perk, Z = 1 when it is 21.00 - 4.59