"Outdoor knife for all-purpose, heavy-duty use. Perfect for those who need a rugged knife. Includes black leather sheath. Model JS-2938."
— GTA Vice City website
In GTA Vice City, the Knife strongly resembles a large Kukri blade. It deals moderate damage, and always inflicts a blood effect on impact, but it's barely effective compared to other melee weapons, but surpassing the Screwdriver.
The Knife is a moderate weapon that allows the player to attack without a firearm and, in GTA San Andreas, allows stealth kills that don't attract unwanted attention.
The Knife is more than just a simple melee weapon. If CJ is aiming behind an opponent, he will execute a stealth kill, quietly slitting the victim's throat, useful when the player is trying to avoid detection and doesn't have a Silenced 9mm. The Knife only produces a single wanted star when used to stealth kill a police officer or kills many people in a short amount of time.
Grand Theft Auto IV
The GTA IV rendition of the Knife resembles the UC-RB1 knife. It can be purchased from Little Jacob for $100. Alternatively, it can be picked up from Eddie Low during his second encounter and from Dardan Petrela in the mission Bleed Out. Although silent kills like in GTA San Andreas are not in the game, 5 to 6 strikes with the knife will kill an opponent, and it will not warrant the player a wanted level. This can easily kill an enemy on single player or multiplayer because 4 to 6 quick slashes while locked on with this will either kill or critically injure anyone, considering the Body Armor doesn't protect against knife attacks. The Knife can also be used for a one-hit kill counter-attack, by dodging an attack with the knife equipped, and pressing the attack button. Compared to the Baseball Bat, it can be weak against an enemy, but faster when attacking them.
Grand Theft Auto V
The Knife looks nearly identical to the Knife in the previous game, except for slightly different serrated edges. The Knife can be bought from Ammu-Nation for $100, but sometimes, it can also be obtained from street criminals. Just like in GTA San Andreas, players can perform stealth kills on people. However, instead of slitting their throat, they simply stab them in the neck. The knife is useful for close encounters, but lacks brute force in comparison to the Crowbar or the Nightstick. It is the one of three weapons that can be used underwater, the others being the Antique Cavalry Dagger and the Brass Knuckles, and thus can be used to fend off sharks, showing its versatility on the environment.
Tudor, Alderney - Can be found just off the northbound on-ramp to the Plumbers Skyway, near a decrepit building and some unused railroad tracks. Alternatively, a parking lot is also next to the location, with some scaffolding which the player can easily climb.
Some pedestrians use it when they feel threatened.
The stealth kill has the same animation as the Hasty knife execution from Rockstar'sManhunt.
There is a glitch involving the Tear Gas. After the Tear Gas is thrown into a crowd, the player can perform a stealth kill on any nearby people. Everyone affected by the gas will undergo the same animation and die at the same time. However there's a rare glitch that if the player performs this within the smoke, they will also die as if someone did the stealth kill on him.
If the player performs the stealth kill and recruits a gang member at the same time, the gang member will undergo the death animation but will stand back up as if nothing happened.
Grand Theft Auto: Liberty City Stories
One can see blood drops from the knife right after attacking someone with it, though this happens very rarely.
Grand Theft Auto IV
It is possible to knock a knife out of an opponent's hands with a baseball bat.
Grand Theft Auto V
The description claims the blade is carbon steel but the blade shows no rust after use in underwater. Unlike stainless steel, carbon steel will rust after use in wet environments but maintain an sharper edge longer than stainless steel.