Arsenal refers to two game modes with similar and unique gameplay mechanics featured in Counter-Strike: Global Offensive. Both game modes are based upon the popular Gun Game mod for Counter-Strike 1.6 and Counter-Strike: Source.
The main change from other game modes is the lack of money during game rounds. Instead, players acquire new weapons by killing the opposition and progressing through the arrangement of weapons.
Gun Game mod
Gun Game was a popular mod for Counter-Strike 1.6, Condition Zero, and Source. The mod introduced a new scenario, in which players would start with the Glock and had to reach the knife round to score for their team. Unlike other game modes, players were allowed to respawn and were normally limited to one firearm and the knife. After eliminating a required amount of players, a better weapon was rewarded.
Generally, the weapon assortment for Gun Game started with a pistol, and progress through to include a shotgun, a submachine gun, an assault rifle, a sniper rifle, a machine gun, an HE grenade, and finally the knife.
Eventually, Valve recognized the mod's popularity and playability, choosing to implement the mechanics into Global Offensive as the Arsenal: Arms Race and Arsenal: Demolition. The new game modes retained the mod's basic gameplay but implemented tweaks to increase the game mode's balance.
Arsenal: Arms Race
- Arms Race & Demolition
Play a round on every Arms Race and Demolition map.
Kill a player who is on gold knife level in Arms Race mode.
Win a match on every Arms Race and Demolition map.
Win an Arms Race match without dying.
Be the first player to get a kill in an Arms Race or Demolition match.
| One Shot One Kill|
Kill three consecutive players using the first bullet of your gun in Arms Race mode.
Win an Arms Race match without reloading any of your weapons.
| Shorter Fuse|
Plant five bombs in Demolition Mode.
| Quick Cut|
Defuse five bombs in Demolition mode.
| First Things First|
Personally kill the entire Terrorist team before the bomb is planted in Demolition Mode.
| Target Secured|
Personally kill the entire Counter-Terrorist team before the bomb is planted in Demolition Mode.
| Born Ready|
Kill an enemy with the first bullet after your respawn protection ends in Arms Race mode.
| Base Scamper|
Kill an enemy just as their respawn protection ends in Arms Race mode.
| Knife on Knife|
Kill an enemy who is on gold knife level with your own knife in Arms Race mode.
| Level Playing Field|
Kill an enemy who is on gold knife level with a sub-machine gun in Arms Race Mode.
| Still Alive|
Survive more than 30 seconds with less than ten health in Arms Race or Demolition mode.
| Practice Practice Practice|
Play 100 matches of Arms Race or Demolition mode.
| Gun Collector|
Play 500 matches of Arms Race or Demolition mode.
| King of the Kill|
Play 5,000 matches of Arms Race or Demolition mode.
Win one match in Arms Race or Demolition mode.
| Keep on Gunning|
Win 25 matches in Arms Race or Demolition mode.
| Kill of the Century|
Win 100 matches in Arms Race or Demolition mode.
| The Professional|
Win 500 matches in Arms Race or Demolition mode.
| Cold Pizza Eater|
Win 1,000 matches in Arms Race or Demolition mode.
| Repeat Offender|
Dominate an enemy.
Dominate ten enemies.
Kill an enemy who is dominating you.
| Can't Keep a Good Man Down|
Kill 20 enemies who are dominating you.
Kill an enemy whom you are already dominating.
| Command and Control|
Kill 100 enemies whom you are already dominating.
| Ten Angry Men|
Kill 10 enemies you are already dominating during a single match.
| Excessive Brutality|
Kill an enemy whom you are dominating four additional times.
| Hat Trick|
Dominate three enemies simultaneously.
| Avenging Angel|
Kill an enemy who has killed a player on your friends list in the same round.
| Unknown achievement name|
Kill an enemy with an un-zoomed sniper rifle in Arms Race or Demolition.
- Shortly after the release of the Arsenal mode in Global Offensive, Counter-Strike Online also introduced Gun Deathmatch as a new game mode.