Sneak

Sneak is a Fallout, Fallout 2, Fallout Tactics, and Fallout 3 skill.

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 unless you have the Silent Running perk.

Fallout, Fallout 2 and Fallout Tactics
Initial Level: Starting Sneak skill is equal to 25%  (1% x Agility). Average characters will have a 30% Sneak.

Fallout 3
Sneaking is one of the most important skills. The closer you can get to a foe without being seen, the higher your odds of hitting him, so this helps with every type of weapon; otherwise, you have to split points between different types of weapons or increase skill for one type at the expense of another.

Sneaking is also a good defensive tool. In a dark hallway, once your Sneak level gets high enough, a Super Mutant will run right by without seeing you.

Several items in the game will increase your Sneak skill (besides the obvious Stealth Boy). One is Recon Armor, which adds 5 to Sneak while worn, and Shady Hat, which adds another 5 and the Chinese Army: Special Ops Training Manual book which add 1+ point per copy found. One possible reward from the Oasis quest is Poplar's Hood which adds +10 Sneak when worn.

Unlike its predecessors, in Fallout 3 a player can both sneak and run at the same time regardless of perks, however, without the silent running perk the player will suffer a detection penalty while running.

The stealth state is displayed while crouching: Note: As soon as the conditions are satisfied for any state it replaces the one above it on the HUD even though the player may still be in the HIDDEN state to several targets around them.
 * [HIDDEN] means undetected by everyone.
 * [DETECTED] means detected by a friendly target or multiple friendly targets.
 * [CAUTION] means being searched for by an unfriendly target or multiple unfriendly targets.
 * [DANGER] means detected by an unfriendly target or multiple unfriendly targets.

Successful sneaking is dependent on many factors:
 * Sneak skill: The Sneak skill applies whenever the player crouches. The higher the player's Sneak skill, the easier it is to remain undetected while attacking, stealing, or picking someone’s pocket.
 * Cloaking Fields: The Stealth Boy will wrap the user in a cloaking field (for a limited time) that makes them more difficult to detect while sneaking.
 * Enemy’s perception: Enemies with low perception are easier to sneak around than enemies with high perception.
 * Line of sight: While out of sight an enemy can only detect the player through sound.
 * Light level: The player is more difficult to see in dark areas or at night if outdoors. The Pip-Boy light, while active, will make the player much more visible.
 * Movement: The player is hardest to detect when motionless, easiest to detect when running. You are able to avoid this by getting the Perk: Silent Running, but motionless will still be the best.
 * Apparel weight: Heavier apparel makes more noise when moving.
 * Sound: Most melee weapons make very little noise; bigger guns make a lot of noise.

Attacking while undetected by the target results in an automatic “sneak” critical if the attack hits. It is possible to miss a sneak attack which will result in detection by the target. For best results, maximize chance to hit as much as possible before attacking so the sneak critical is not wasted. It is possible to get sneak critical while being detected by one target, friendly or unfriendly, on another target that has not detected the player.

It is possible to kill an enemy without alerting those around them if the "sneak" critical is also a one hit kill even with loud weapons like the Assault Rifle. Additional attacks after the first, queued in V.A.T.S., will be treated as non-sneak attacks and will reveal the player's location to the target and possibly other enemies, presumably because the target then alerts their friends.

If the player can close to melee range of an enemy while remaining undetected by the target they can then be pickpocketed and a live mine or grenade can be added to their inventory. The explosive will detonate after a short timer automatically killing the target regardless of the player's explosive skill or the target's health or resistances. The explosion can damage or even kill the player if they do not move out of the area or take cover quickly.

It should also be noted that when a player enters third-person perspective, they are able to peek around corners without being seen. This minor trick can be useful sometimes when sneaking to see what type of enemies are around corners or if there are any traps. Be careful when sneaking in dark areas or at night as you may accidentally step on a trap or landmine. This can be avoided with the Perk: Light Step.

Sneaking-Stealing:

While using a stealth-boy and remain undetected, you will steal almost everything.

Using mesmetron, a weapon from Paradise Falls, unfortunately doesn't work to get anybody's gear. Tried to steal Smiling Jack's The Terrible Shotgun - he turned hostile.

If you want to steal an item the NPC is currently wearing or using (Armor or Weapon), you can give a better item to the NPC using Sneak and then leaving and reentering the area. The NPC will equip the item with the highest stats and you will be able to steal the item he was using before.

Stealing Items:

One easy way to steal items in shops (as in Rivet City) is to simply pick up the item (gun, chem, food, etc.) by clicking the right thumb stick. You can then drag the item to a concealed area, go into sneak mode, and steal it without anyone noticing. This is a good way to aquire any goods you see on display or simply to collect items (like chems) to sell back to the shop owner.
 * NOTE: The items you steal cannot be sold back to the original shop, but will still be in your inventory and can be sold to any other shop
 * NOTE: You will still lose karma when doing this

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