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Counter-Strike Online

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Counter-Strike Online
Developer(s) Valve Corporation
NEXON Corporation
Publisher(s) Valve Corporation
NEXON Corporation
Platform(s) Microsoft Windows
Release date(s) 2008
Genre First-person shooter
Mode(s) Multiplayer

Counter-Strike Online (CSO) is a spin-off multiplayer first-person shooter in the Counter-Strike series targeted towards the Asian gaming market, developed by South Korean company NEXON Corporation with oversight from license-holder Valve Corporation, using the GoldSrc engine. Some of the models and maps are reused from Counter-Strike: Condition Zero. It uses a micropayment model that is managed by a custom version of the Steam back-end.

A sequel titled Counter-Strike Online 2 is currently in development.


Counter-Strike Online features some old game modes from the previous games in the series as well as new ones, modified version of custom modes:

  • Original
  • Deathmatch
  • Team Deathmatch
  • Gun Deathmatch
  • Item Battle
  • Basic
  • Zombie Original
  • Zombie Mutant
  • Zombie Union
  • Zombie Hero
  • Zombie Darkness
  • Zombie Scenario
  • New Zombie Shelter
  • Human Scenario
  • Metal Arena
  • Challenge
  • Hidden
  • Zombie Escape
  • Bazooka Battle
  • Beast
  • Zombie Giant
  • Fight Yard


The game also features a variety of additions over the international games, such as an introduction to female characters, numerous new weapons and skins for previous weapons. Most of the weapons are "locked" by default, so cash points or game points are essential to purchase them. Cash points are purchased through real-world money for special weapons, skins, power-ups, etc. You can also buy standard weapons for periods of time using game points earned from playing the game.


The players compete each other to get the highest kill. After death, the player will respawn randomly on the map in 5 seconds and invincible for 3 seconds.

Team Deathmatch

Counter-Terrorists compete with Terrorists to get the highest kill score. No specific goal and the players will respawn in 5 seconds and invincible for 3 seconds after death.

Zombie Original

Zombie Original closely follows the popular, unofficial mods of Zombie Mod - specifically, Infection mode.

Zombie Mutant


  • If standing idle and not attacked for 3 seconds, zombies regenerate their hit points.
  • The host zombie can use its special ability by pressing the G key.
  • Humans can see the location of supply boxes on radar.
  • Press the V key to toggle supply boxes on radar.

New human items:

  • Bomb Specialist: Can hold 2 HE Grenades at a time.
  • Nata Knife: This beautifully curved single-blade knife is designed to enhance its range and damage.
  • Hammer: Although it is woefully slow and inefficient as a weapon, the secondary fire from it can knock away the incoming zombies.
  • Sprint: When activated, the user can run faster than the zombies for 10 seconds. However, the user will get exhausted later on and moves very slow for 5 seconds.
  • Firebomb: When thrown and exploded, it will cause continuous burn damage to the victim for several seconds.

New zombies:

  • Light zombie: An abomination created by Dr. Rex, this zombie is code-named as 'Light type'. This specimen boasts fast movement and good jumping ability but is vulnerable when attacked. The Light Zombie host possesses the ability to turn itself invisible.
  • Heavy zombie: An abomination created by Dr. Rex, this zombie is code-named as 'Heavy type'. This specimen is excellent for breaking humans' defensive line, and can absorb some of damage taken. The Heavy Zombie host has an ability to pull out a device inside its body that can be used as a trap to ensnare the unlucky humans.
  • Psycho zombie: This zombie was originally a co-worker biologist of Dr. Rex, when it was a human. He turned into a zombie in an accident, earning the nickname of 'psycho type'. The Psycho Zombie host have the 'Smoke' skill that screens an area with thick smoke.
  • Voodoo zombie: Willingly exposed themselves to Dr. Rex's virus in pursuit of higher power, these former voodoo shamans draw great power to heal other zombies and curse enemies so that they cannot use skills or items for a certain period of time.
Zombie Hero


  • Zombie that stay in place for three seconds and not subject to any attack will automatically restore health value.
  • All zombie skills can be used via shortcuts column to correspond the skills.
  • Unless head shot, zombie will revive after a few seconds.
  • Human's attack power will be increased by 10% for each death of a zombie.
  • Press the <V> key to open/close the display of the location for the supply box.

New human items:

  • Deadly Shot: When activated, the user can do fatal damage to zombies for 5 seconds.
  • Bloody Blade: When activated, the user's melee weapon's damage is doubled for 5 seconds.

New zombies:

  • Deimos: A special zombie that started to appear in a large scale since Prototype Phobos has been discovered. Its DNA has been identified as the similar type as Phobos. This zombie is strong and powerful as it possesses most of the advantage that the current discovered zombies own. It has a skill to drop enemy's weapon with a long distance attack or make them unable to attack for a period of time.
  • Ganymede: It has been classified as Siege Type Deimos according to Aegis laboratory and it is called Ganymede. Ganymede is very threatening as it has a strong HP and agility to attack human. Beside that, he can pass through bullets easily. It also has the skill to rush towards enemy with a very fast speed.
Zombie Hero

This the first update for Zombie Hero where it includes new items:

  • Salamander (flamethrower)
  • Stamper (Undertaker zombie)
  • Banshee (Witch zombie)
  • Jiang Shi (Chinese zombie)
Zombie Hero

The Z-Virus Update is the second patch for Zombie Hero with new zombies and weapons. The new items introduced are:

  • M32 MGL (6 rounds grenade launcher)
  • Sting Finger (Infected Female Researcher)
  • Venom Guard (Infected Security Guard)
Zombie Darkness

This is a mode where players are divided into minor zombie and major human team. The goal of this mode for the zombie team is to find human players to make them as zombies within the time limit while the human team either escapes from the zombies or annihilates them. Additionally, zombie will become stronger when the darkness comes to visit them.


  • Zombie can only be killed forever with concentrating fire.
  • Adrenaline will be obtained as time goes by.
  • Useful weapons are dropped everywhere in the map.
  • HE Grenade, Flashbang and Smoke Grenade have special effects.
  • Can obtain extra EXP and Point according to the damage that you give to the zombies.


  • Normal Zombie: have an ability to rush and can also climb on the wall. Defense ability is average.
  • Light Zombie: Can hide during rush and rapidly jump high to attack. However, defense ability is low.
  • Heavy Zombie: Focuses on defense while moving. It has an ability to jump high to shake earth's axis.Defense ability is very strong.
  • Night Stalker: High defense and strong mobility zombie. When [Hardening Sprint] is activated, defense will increase as using his arm to protect the body. When leap into the air, you have the second jump to raid the enemy in split seconds.
  • Spin Diver: Highly maneuverability zombies, although defense and movement speed are low, but when [Rolling] ability is activated, able to roll to speed up. Can be activated by double pressing W. When special abilities [Pounce] is activated, jump forward in medium height to rush the human. Can be activated by right click. Consumes energy for each usage.
Challenge Mode


  • The player who passes the finish line first wins.


  • Players receive points when they reach the finish line.
  • Only the record from games played in the Official Challenge Server will be registered.
  • To go back to the start line, step over the red line past the finish line.
  • Players are free to time their progress while the game lasts.
Zombie Scenario

This mode requires cooperation from human players to fight against zombies that are manipulated by the computer.

  • Goal: Fight against the zombies and survive until the end.
  • Features:
    • You can purchase or upgrade weapons in shop areas by clicking 'B'.
    • '5 Key' and '6 Key' are for HP recovery and 'R Key' is for battle revival.
    • You can use the 'R Key' to activate the round retry item when the mission has failed or when the team has been annihilated.
    • There is maximum dollar benefit for the person who uses the round retry item.
    • Your ranking will be registered only when you select $800 as minimum possession money.(You cannot use the related item with respawn)
    • You will receive more bonus when you clear the round by survival status.
Zombie Scenario
  • Goal: Kill certain targets after arriving at the destination by following the designated road.
  • Features: There are 60 seconds to wait for your respawn after you die but you can immediately respawn by using 'R Key'.

Includes 2 new soccer maps and new character skins. The main objective is basically to score points by kicking the ball into the oppositions goal. Players are allowed to purchase items and stab enemies during the gameplay. There are special shots that can be used in the game:

  • Power Shot
  • Cannon Shot
  • Night Hawk Shot
  • Summon Shot
  • Ghost Shot
  • Twister Shot

Hidden was released on 1st week of January 2012. The first player who reaches the target kills wins the game. Hidden follows an unofficial Half-Life 2 mod, The Hidden. In Hidden, a player will be chosen as the Joker and needs to eliminate the other players. The Joker has 300 health points and will be fully invisible when stationary while half-invisible when moving.

Zombie Escape

The humans must escape from the zombies by reaching the escaping vehicle. This mode is round-based.At every round player will be chosen as the Host zombie and must infect all humans and prevent them from reaching the escape zone. The humans that succeed reaching the escape zone will be safe while the late ones will be left behind and die.

Bazooka Battle

Bazooka Battle was released on January 31, 2012 for Korea server. In this mode, the players can only use Bazooka and must eliminate the opposing force. The players in this mode can move faster than usual.

Gun Deathmatch

Gun Deathmatch is based on a Counter-Strike mod, Gun Game. This mode was released on March 2012, as the response of a new Counter-Strike: Global Offensive mode, Arsenal. The gameplay is similar to the Gun Game with several modifications.


The default models are reused from Counter-Strike: Condition Zero.





  • Natasha - Top sniper
  • Choijiyoon - 707 Commander
  • Criss - SAS top medic
  • Mei - Chinese spy
  • Keith Icahn - Famous zombie hunter
  • Gerrard - SAS general (Gordon Freeman resemblance)
  • Lucia - Marine commander
  • Enzo - Marine soldier
  • Natasha (casual) - Top sniper (casual clothes)
  • Fernando - Demon exorcist
  • Alice (Limited Edition)
  • Walter - Aegis Institute mercenary
  • Choijiyoon (Limited Edition)
  • Isabelle - A former boxer
  • Master Craftsman Henry Stoner - A craftsman


  • Jennifer - Experiment sample
  • Ritsuka - Reborn of Athena
  • Yuri - Bomb expert
  • Erica - Japanese high school student
  • Spade - Zombie terminator
  • David Black - SAS traitor
  • Michaela - Pirate captain
  • Raven - Pirate member
  • Jennifer (Army) - Experiment sample (army clothes)
  • Blair - Professional hunter
  • Yuri (Limited Edition)
  • Carlito - Vanguard Contact mercenary
  • Michaela (Limited Edition)
  • Lingling - An idol
  • Gunsmith - A craftswoman
  • Alin - An adept B-girl


  • Alice - Main protagonist in Metal Arena mode.
  • Andrey - The Hero in Zombie: The Hero. Use very powerful weapons.
  • Kate - The Heroine in Zombie: The Hero.
  • Doctor Aegis - Secret mission briefer that is related to zombie incident in Rex Research Institute.
  • Evelyn - A mission provider.
  • Felix - Ditto.
  • Jacob - Ditto.
  • Victor - Commander in Human Scenario mode.
  • Zim - Commander Victor assistant.
  • Doctor Rex - Antagonist NPC appeared in Envymask chapter and final boss in Madness End chapter.
  • Soy - Alias Dr. A, researcher and owner of Aegis laboratory

Weapons and EquipmentEdit

There are many exclusive new items in Counter-Strike Online.

  • Colt Anaconda - 7 rounds revolver that has higher rate of fire than Night Hawk but lower damage.
  • SVI Infinity - 8 rounds pistol that can be upgraded.
  • Luger P08 - World War II weapon that can be enhanced to repair its weaknesses.
  • Dual Infinity - 30 rounds dual-wielded pistols that can be upgraded.
  • King Cobra - 7 rounds revolver with scope and does moderate damage.
  • Daewoo USAS-12 - 20 rounds automatic shotgun that is very heavy.
  • Winchester M1887 - Lever-action shotgun that can knock away zombies.
  • Double-barreled shotgun - 2 rounds shotgun that can knock away zombies far far away.
    • Triple-barreled shotgun - Upgraded version of double-barreled shotgun, 3 rounds shotgun.
    • Quad-barreled shotgun - Kate's main weapon.
  • Kel-Tec KSG-12 - 15 rounds pump-action shotgun.
  • Franchi SPAS-12 - 8 rounds pump-action shotgun that can deal very high damage and can be upgraded.
  • UTAS UTS-15 - 15 rounds High rate of fire for a pump action shotgun.
Submachine guns
  • HK MP7A1 - 20 rounds machine pistol that can change mode from carbine mode to sharpshooter mode.
  • Daewoo K1A - 30 rounds submachine gun that can work as an assault rifle.
  • TDI Kriss Super Vector - Upgraded version of UMP45 that can be attached with silencer.
  • Thompson Chicago - World War II submachine gun that does moderate damage.
Assault rifles
  • FN SCAR-L - Standard issue assault rifle for Counter-Terrorists.
  • FN SCAR-H - Limited edition based on SCAR-L except does higher damage.
  • M14 EBR - High damage but low fire rate, heavy weight and low ammo. (20)
  • M16A4 - 3-rounds burst fire only assault rifle exclusive for CTs.
  • HK XM8 Carbine - Standard issue assault rifle for Terrorists.
  • HK XM8 Sharpshooter - Ditto, limited edition version that can be changed to Sharpshooter mode.
  • IMI TAR-21 - Standard assault rifle that has the ability to knock zombies far far away.
  • AN-94 - 2-round burst fire only assault rifle exclusive for Terrorists.
  • FN F2000 - Limited edition assault rifle.
  • AK-47 60R - Limited edition assault rifle that can be found in Zombie Mods. It does very high damage to zombies and has no recoil.
  • AKM - An AK-47 alternate skin.
  • StG 44 - World War II assault rifle that can be enhanced to repair its weaknesses.
  • QBZ-95B - A China assault rifle which shares same performance as Galil.
  • M16A1 - An assault rifle that is the original version of M16A4.
  • HK G11 - 50 rounds assault rifle.
  • OICW - An assault rifle equipped with a grenade launcher.
Bolt action sniper rifles
  • Remington M24A2 - Has 99% base damage but it is as light as knife.
  • Sako TRG-42 - Alternate to AWP and a bit lighter.
  • CI M200 - Limited edition bolt-action snipe rifle that shares the same attribute with AWP except it is lighter.
  • Remington XM2010 ESR - AWP-like except it is the lightest but can hold 5 rounds only at a time.
  • M95 - Bulpup style bolt action sniper rifle that carried 5 rounds of 50. BMG
  • AW50 - Bolt action sniper rifle that carried 5 rounds of 50.BMG
  • R93 - Bolt action sniper rifle that's similar to Magnum sniper rifle but only can carried 5 rounds of 338. Lapua Magnum
  • Parker Hale M82: This sniper rifle holds 10 of 7.62mm NATO rounds for each magazine. It possesses a constant high accuracy even in movement. The first stage of scope allows you to react quickly and effectively to adapt to any situations.
Automatic sniper rifles
  • VSK-94 - High rate of fire but low damage.
  • Dragunov SVD - High firepower but low rate of fire automatic sniper rifle.
  • HK SL8 - High rate of fire automatic sniper rifle but does low damage.
  • Walther WA2000 - SVD-like but has higher rate of fire and extra 2 rounds per mag.
  • AI AS50 - A semi-automatic anti-material sniper rifle that carried 5 rounds of 50.BMG
  • PSG-1 - 5 rounds semi-automatic sniper rifle.
Machine guns
  • QBB-95 - 75 rounds machine gun that has short reload time and light weight.
    • QBB-95EX - Improved version of QBB-95, 80 rounds and 400 magazine capacity.
  • HK23E - Low damage 100 rounds machine gun but it is light.
  • M60E4 - 100 rounds machine gun that has high firepower but heavy.
  • MG36 - 100 rounds machine gun that does moderate damage but it has high rate of fire and light in term of weight.Plus it has a 1.5 X 1 scope
  • Rheinmetall MG3 - 200 rounds machine gun that does moderate damage and high rate of fire but it is heavy.
  • Skull-7 - 120 rounds machine gun which can deal high damage especially to zombies
  • Izmash PKM - 150 rounds machine gun that does moderate damage but has high recoil
  • FN MK48 - 120 rounds machine gun that deals higher damage than Skull-7 and as light as HK23 but it has low rate of fire
  • Avalanche - 200 rounds fictional machine gun that does high damage for mode A but low rate of fire and low damage but high rate of fire for mode B
  • Balrog 7- Machine gun that fired 120 rounds of 7.62mm AHE that can be exploded after each 5 rounds
  • K3 - Standard issue 70 rounds machine gun and can be enhanced to repair its weaknesses.
  • M2 Browning - 250 rounds portable heavy machine gun.
  • M134 Minigun - 200 rounds minigun that has very high rate of fire. However, it is very heavy and has 1.5 seconds attack delay.
    • M134 Predator - Secondary fire has the ability to roll as shoot stand by action. It is 3% lighter than the original weapon but it is less accurate by 4%.
  • M79 Sawed-off - Grenade launcher.
  • Crossbow - 50 rounds crossbow.
  • Salamander - 100 nitrogen gas flamethrower.
  • Antidoter - Upgraded version of salamander, loaded with 200 nitrogen gas and can only be found randomly from supply boxes in Zombie Mutant and Zombie Hero.
  • Milkor M32 MGL - 6-slot grenade launcher with usable scope.
  • AT4 - A rocket launcher that can be used in Human Scenario and Metal Arena modes only.
    • AT4-CS - Upgraded version of AT4 that can be used in all modes.
  • Ripper - A premium chainsaw that can be obtained from Lunar New Year 2013 Event.
    • Slasher - A downgrade version of Ripper that is sold in shop.
  • Bazooka - A standard issue weapon in Bazooka Battle.
  • Black Dragon Cannon - A premium cannon that can obtained from Lunar New Yer 2012 Event.
    • Eruptor - A downgrade version of Dragon Cannon that is sold in shop.
  • Tactical Knife - A throwing knife that serves as a backup secondary weapon.
  • Gae Bolg - A spear gun that can shoot exploding harpoons.
  • Drill Gun - A modified drill to shoot a rotating drill bit.
  • Petrol Boomer - A petrol bomb launcher that can shoot petrol bombs.
SKULL Series
  • SKULL-1: A 7 rounds revolver that can be fired in full-auto mode.
  • SKULL-3: A 35 rounds submachine gun that can dual-wielded.
  • SKULL-4: A 48 rounds dual wielded assault rifle.
  • SKULL-5: A 24 rounds automatic sniper rifle that has a very quick reload time.
  • SKULL-6: A 100 rounds machine gun with sniper scope.
  • SKULL-7: A 120 rounds machine gun with optical scope.
  • SKULL-8: A 120 rounds machine gun with axe bayonet.
  • SKULL-9: A battle axe made from special alloy.
  • SKULL-11: A 28 rounds automatic shotgun equipped with alternate slug fire mode.
  • BALROG-I: A 10 rounds semi-automatic pistol equipped with an explosion alternate fire.
  • BALROG-III: A 30 rounds submachine gun that can be fired continuously without having to reload.
  • BALROG-V: A 30 rounds assault rifle that can do massive damage when fired on a single target.
  • BALROG-VII: A 120 rounds machine gun that can do an explosion shot for every 10 shots.
  • BALROG-IX: A pair of battle gauntlet that can do an explosion punch.
  • BALROG-XI: A 7 rounds automatic shotgun that can be fired in dragon breath mode.
JANUS Series
  • JANUS-1: A 5 rounds grenade launcher that can be fired in unlimited grenade.
  • JANUS-3: A 50 rounds submachine gun that has a quick JANUS Transformation System.
  • JANUS-5: A 30 rounds assault rifle that can do massive damage when transformed into JANUS mode.
  • JANUS-7: A 200 rounds machine gun that can do lightning strikes when fired in JANUS form.
  • JANUS-9: A special mace/morning star that can do massive damage when attacking continuously.
  • JANUS-11: A 15 rounds pump-action shotgun that can shoot lasers in JANUS form.
  • M24 Grenade - Can be thrown further than normal HE Grenade.
  • Frag Grenade - Standard issue grenade in Frag War mode.
  • Firebomb - When exploded, can burn zombies. Only usable in Zombie Mods.
  • Holy Grenade - A special grenade for Fernando.It do higher damage to zombie and has an burning effects that does 100~200/second.It ONLY usable in Zombie : The Mutation and Zombie : The Hero
Melee weapons
  • Hunting dagger - Use CZ animations.
  • Balisong - High rate of fire for both primary and secondary attacks but does low damage.
  • Wedung - High damage but low swing rate.
  • Nata knife - Very high damage. Restricted in all modes except Zombie Mods.
  • Hammer - Sledgehammer that can knock away zombies.
  • Combat knife - Excellent knife that is very reliable in knife battles
    • Master Combat knife - Ditto, but with longer attack range, higher damage and has serrated blade
  • Skull-9 - A powerful axe usable in any modes (except Gun Deathmatch, Soccer,and Zombie Shelter).
  • Tomahawk - A hatchet that deals high knockback to zombies.
    • Shelter Axe - An alternate skin for Tomahawk. It serves as the default melee weapon in Zombie Shelter and the player must use it to collect resources and attack enemies. It can be upgraded to Hammer later after had purchased it (only in old update).
  • Dual Nata Knives - An upgraded nata knife with higher damage and dual-wielded, can only be found in Zombie Mods.
  • Green Dragon Glaive - A powerful spear usable in any modes (except Gun Deathmatch, Soccer,and Zombie Shelter).
  • Wakizashi - Ditto, A japanese sword
    • Dual Wakizashi - An upgraded Wakizashi.
  • Serpent Blade - Same animations with Wakizashi.
  • Beam Sword - Ditto, based off from the popular Star Wars films.
  • Machete: A special melee weapon for Combatants in the New Zombie Shelter mode.
  • Crowbar: A special melee weapon for Survivors in the New Zombie Shelter mode.
  • Claw Hammer: A special melee weapon for Engineers in the New Zombie Shelter mode.
Science Fiction series
  • Blaster - 45 rounds fictional assault rifle.
  • Ethereal - 30 rounds fictional assault rifle.
  • Volcano - 40 rounds fictional shotgun.
  • Tempest - 30 rounds fictional submachine gun and lighter than knife.
  • Avalanche - 200 rounds fictional machine gun that does high damage for mode A but low rate of fire and low damage but high rate of fire for mode B
  • Thunderbolt - 20 rounds fictional bolt action sniper rifle.
  • Cyclone - 50 rounds fictional pistol.
  • Plasma Gun - 45 rounds fictional assault rifle.
  • Rail Cannon: A 24 rounds shotgun that can accumulate 3 rounds at a time for a laser burst shot.
  • Plasma Grenade: A special grenade that can be attached to any terrains when thrown.
Steampunk Series
  • Savery - A 7 rounds revolver sniper rifle.
  • Aeolus - A 150 rounds machine gun with flamethrower.
  • Papin - Ditto.
Maverick Series
  • SPAS-12 Maverick: A 20 rounds shotgun that can be reloaded quickly.
  • M1887 Maverick: A 6 rounds pistol that can fired while reloading.
  • Galil Maverick: A 45 rounds assault rifle that can be reloaded quickly.
  • M60E4 Maverick: A 200 rounds machine gun with high damage and can be zoomed via scope.
  • K1A Maverick: A 30 rounds submachine gun that can be fired in semi-automatic.
  • Crowbar Maverick: A modified crowbar that works as a taser.
World War II
  • Mosin-Nagant Scope
  • Mauser C96
  • MG42
  • MP40
  • M1 Garand
  • M1918 BAR
  • Sten Mk2
  • M1911 A1
Journey to the West

The performance of these weapons are boosted when the player equips all these 3 weapons.

  • Zhu Bajie Minigun: The modified version of M134 Minigun.
  • Sha Wujing Dual Handgun: A modified water pistol.
  • Ruyi Stick: A legendary stick used by Sun Wukong. Its length can be increased.


Counter-Strike Online 2Edit

Counter-Strike Online 2 is another free-to-play massively multiplayer online video game developed by Nexon of South Korea using the Source engine from Valve software. It's firstly introduced in late 2012 and has ended its Beta stage January 2013.

Counter-Strike Nexon: ZombiesEdit

Counter-Strike Nexon: Zombies is the first adaptation of infamous Counter-Strike Online to the USA via Steam, available from 23 September 2014,and officially relaunched on 7 October 2014.[1]

External linksEdit



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