"Each player starts with the same basic pistol. Every time you kill an enemy with your gun, you're upgraded to the next weapon. Anyone killed with a melee attack is demoted to the previous weapon, so watch your flank. Suicides also set you back to the previous tier, most often occurring when using explosive weapons. The match ends when someone cycles through all twenty weapons. Success in Gun Game requires aggressive tactics and familiarity with each weapon in the rotation. Don't worry about dying - just go for a lot of successive kills. "
In Call of Duty: World at War, it is possible to play a game of Gun Game in a modded lobby, if the host chooses to.
Like all other Wager game modes, killstreak rewards are disabled.
Direct suicides with a weapon will result in a demotion. By definition, this means being caught in the blast of an explosive weapon's splash damage. Suicides by car bombs or red barrels will also demote the player, but suicide by fall damage will not.
If the player kills someone else by blowing up a car with a launcher, they don't advance to the next tier.
Double kills with a weapon don't advance the player two tiers.
If the player kills someone with a launcher and then kills themselves, they will go back one tier. However, if the enemy damaged the player before he/she killed themselves, the other player will get an "Assisted Suicide" kill, but will not advance.
Kills from the grave (afterlife kills) will advance the player a tier. This frequently happens when using the Crossbow.
The console codename for Gun Game is gun.
If the player wants to play a "fake" Gun Game, then all that has to be done is that the player needs to have a map loaded followed by opening the console (PC version only) and type in \g_gametype gun followed by \map_restart. Then the game will change to a "fake" Gun Game (a regular Gun Game that isn't related to CODpoints in any way).
David Vonderhaar, the design director for Treyarch, states that the idea for this game mode came "straight from the community," which was a thread created on their own Community Forums. Gun Game had an overwhelming demand from the majority of the community.
Gun Game was originally a modded game type for Counter-Strike, an immensely popular PC game.
Call of Duty: Black Ops
The Grim Reaper was removed from Gun Game in late December 2010 and was replaced with the RPG, due to it being glitched. It was not changed on the Wii, which did not have the glitched Grim Reaper. Due to a patch in late April 2011, the glitch on PS3, PC and Xbox was removed and the Grim Reaper is used again as Tier 16 on every system.
Even though the icon for Gun Game is a Commando, it is not featured in the game mode.
In Defiance there is an in-game glitch that occurs when the player kills an opponent with their gun, then knifes them. The player will go a tier up, but they will retain the current gun they had in their previous tier. This is probably due to the fact that the successful kill is acknowledged as a gun kill, but since the knife also deals a blow, the gun that is to be given is cancelled out.
Call of Duty: Ghosts
In Ghosts, the first sixteen weapons are randomized within their class, with random attachments. The player can view their current weapon and attachments by selecting Change Class in the menu. However, the assault rifle at thirteen will always have no attachments and the shotgun at fourteen will always have the Slug Rounds attachment in conjunction with a Red Dot Sight.