Knifes are a very common melee weapon in Deadbolt. They can be found in several levels, mostly stuck in knifeblocks, giving the player the chance to use up to four knives in some levels. The Knife can also be purchased from Charon as a secondary weapon for the price of 20 souls.
Knifes can either be used as a melee weapon (using left click) or a projectile, if you hold right click and then left-click. When thrown, the knife will do more damage than most bullets and when used for melee, it approximately doubles your damage in comparison to the punch. After being thrown, knives can always be picked up again, unless they damage an enemy, in which case they disappear.
If a knife hits a security camera, they have a chance of falling out of it, making the knife retrievable again. However, sometimes the knife will just stay stuck in the head and will be therefore lost.