Zombie Z

For Counter-Strike Online 2 version, see Zombie Z/CSO2.

Zombie Z is a game mode in Counter-Strike Online.

Overview[]

Every round evolving zombie and human ability! Get a virus score through battle, consume your score and make a variation. Every time you make a mutation, you gain random power and become more powerful.

Objective[]

Human: Survive zombie attacks or kill all zombies for the rest of the time.
Zombies: Infect all humans.

Tips[]

During battle, if you accumulate virus scores, your level will increase.
You can increase the number of weapons and zombie classes you can use depending on your level.
You can level up by attacking zombies as human, taking damage as zombie, and through round progression.
When purchasing random weapons, only weapons that match your level appear.
You start with the Battle Glock, Rather than the USP.

Mode Settings[]

Damage score will pop out on the target when you do damage to zombies or humans.
Flashbang will be turned into Liquid-Nitrogen Grenades upon acquiring the "Nitrogen Grenade" mutation. Upon detonation, it will freeze (and push away from the center of detonation) zombies, rendering them immobile and unable to attack.
Smoke grenade will be converted into Vaccine Grenades, which will damage zombies within the hazy blue mist it creates upon detonation.

Competitive Rule (BETA)[]

Copetitive Rule is a new system introduced in December 2021 update in South Korea for Zombie Hero and Zombie Z modes that introduce a new set of rules for competitive matches.

If it is set as a competitive match, all existing room settings are ignored and the game settings are changed to the set settings, and you cannot change the settings arbitrarily.

For more detailed information about the competitive rules, you can check them by clicking the 'Competitive match rules guide' button in the preview above and in the waiting room.

Competitive Room settings:[]

Max Players: 32 Players
Number of Rounds: 13 Rounds
Round Duration: 3 minutes
Weapon Limit: Cost Limit
Manner level, No death > Kill limit
Competitive Rooms can't be password locked
No Zombie Permanent Death
AI will be in the match
Allies cannot attack
Zombie Balance Auto Correction
Map: At the start of the game, one of the six maps specified below is randomly selected.
- Italy
- Assault
- Estate
- Falls
- Dust
- Cargo Ship

Weapon Cost Limit:[]

All weapons have a cost according to their grade, and the total cost of 4 weapons can be used only for the main weapon/sub weapon/melee weapon/throw weapon and less than 25.

If the total cost of the weapons you possess, purchase, or acquire exceeds the total cost of 25, you cannot purchase or acquire them.

Grade	Cost
Epic	19
Transcendent	10
Unique	7
Rare	4
Advanced	1
Basic	0

Rules changes:[]

The amount of karma obtained is doubled.
Random Human Heroes do not appear in Competitive Play, and you must use Karma to play as a Hero.
Zombie heroes may appear randomly after all zombies are unlocked.
Depending on the Zombie Z level, the fixed number of mutations increases, and some mutations do not appear.

Zombie Stats[]

HP	Armor	Speed	Jump	Defense	Stun	Knockback	Unlock Level
20,000	5000	75	69	50	50	58	1
20,000	5000	90	93	35	55	22	6
20,000	5000	72	53	75	50	88	21
20,000	5000	75	73	39	50	52	13
20,000	5000	75	73	55	50	55	10
20,000	5000	75	63	50	50	61	31
20,000	5000	69	63	64	52	85	19
20,000	5000	75	83	39	57	50	28
20,000	5000	63	73	67	52	75	12
20,000	5000	72	83	50	50	58	14
20,000	5000	72	53	69	50	58	8
20,000	5000	82	83	25	55	22	23
20,000	5000	82	93	30	55	22	30
20,000	5000	75	83	50	50	58	25
20,000	5000	75	93	32	55	22	36
20,000	5000	75	63	50	50	62	16

Updates[]

2025[]

February

Extend Mode
Added play maps: Sky Garden, Estate

Mutation	Changes
Zombie Booster	Increased experience and karma gain when playing zombies. You gain human karma equal to the karma you gain from playing zombies.
Patience	If you are human, your attack power will be reduced for a certain period of time after the round starts. After a certain amount of time has passed, you will be able to attack and gain an attack power increase buff.
Unlocking restrictions	Instead of weapon unlocking increasing proportionally with player level, you gain a buff that increases attack power. Unlock level increases by 1+ (+1 every 8 levels) (Levels 1~8: +1, Levels 9~16: +2, Levels 17~24 : +3, Levels 25~32 : +4, Levels 33~40 : +5)
Friend	Marks one other human player as a special target to that player only. Increases attack power and continuous health regeneration when located near a special target.
Manual growth	You will no longer automatically level up at the start of a round. Gain the number of mutation reacquisitions per level achieved. Retroactive application of level at the time of acquisition of special mutation.
Special Bonus	Gain a random additional mutation without spending mutation points.
Maturity savings	When reaching max level, obtain 3 additional mutations, mutation reacquisition count 4 times, the dollar cost to acquire mutation Lv.2 has been changed to 0.
SMG Master	If the primary weapon category you are using is a submachine gun, the primary weapon attack power increases.
Shotgun Master	If the primary weapon category you are using is a shotgun, the primary weapon attack power increases.
Secondary Weapon Master	Primary weapon cannot be used from the moment of selection, and primary weapon cannot be purchased or acquired thereafter. Increased secondary weapon attack power. "Base increase + increase per round"

April: With this update, the maps exclusive to Extend will be deleted, and the content provided in the existing Extend maps will be applied to all Zombie Zs.

Experience Limit
- The maximum level you can reach in a round is limited.
- The level limit is 4 levels in the first round, and increases by 4 levels in each subsequent round.
- When you reach the maximum level in a round, you can no longer gain experience, but instead, the amount of karma you gain increases.

Added special mutation system
- During the game, two special mutations are provided at each round, and you can choose one of them to obtain it.
- Special mutations do not consume mutation points.

Name	Mutation
Zombie Booster	When playing as a zombie, gain both zombie/human karma.
Patience	Attack power is greatly reduced at the beginning of the round, but increases thereafter.
Unlock Increase	Attack power increases instead of increasing weapon unlock level.
Friends	When playing with friends, combat power increases.
Self Growth	You do not level up automatically, but you gain the number of mutation reacquisitions.
Resurrection Ticket	You can be resurrected as a human once in the game.
Diversity	If all weapons in use are of different grades, an additional effect occurs.
Bonus	You gain additional mutations.
Escape Master	When health decreases, an additional effect occurs for a certain period of time.
Vampire	Recovers health when dealing damage.
Maturity Savings	You gain an additional effect when reaching the maximum level.
Submachine Gun Master	Increases the attack power of the submachine gun.
Rifle Master	Increases the attack power of rifles.
Shotgun Master	Increases the attack power of shotguns.
Machine Gun Master	Increases the attack power of machine guns.
Secondary Weapon Master	Cannot use primary weapons, but increases the attack power of sub-weapons.

Mutation Reacquisition System
- You can delete unwanted mutations and reacquire other mutations through the mutation reacquisition function (L key).
- Special mutations and some fixed mutations cannot be deleted.

Karma Effect Changes
- Sub-karma effects are removed, and some of the karma effects by faction have also been changed.

Faction	Karma Level	Change Effect
Human	1	Add 1 mutation reacquisition
	2	Activate all human mutations during Karma use round. Add 1 mutation reacquisition
	3	Play as a Hero
Zombie	1	Increase max health until end of game
	2	Respawn time reduced until end of game. Hero Zombie Play
	3	Increase max health until end of game. 6 seconds invincibility. Max health, defense buff for a certain period of time

Random Weapon Purchase Changes
- Instead of purchasing more efficient weapons (weapons with a high selection rate at the current level are given priority) based on the player's level, reward effects have been removed and the purchase price gradually increases depending on the round.

2024[]

December

Three maps exclusive to Zombie Z mode with the update applied will be released.
Applied maps: Dust EX, Italy EX, Assault EX.
Medals cannot be obtained by playing the corresponding maps. (Ex - Is there such a mutation, Super Soldier Z)

The following changes will be applied to the applicable maps.

Level system change

The maximum level that can be reached is limited depending on the round.
When reaching the maximum level for the corresponding round, experience gain is limited, but karma gain increases.

Special mutation system added

Special mutations that can be obtained by selecting the desired item from the options provided in a specific round will be added.
The special mutations that appear have different effects than existing mutations and do not consume mutation points.

Karma Effect Changes

Some Karma effects by faction will be changed, and sub-karma effects will be removed.

Addition of Mutation Reacquisition System

A system will be added that allows you to delete unwanted mutations and reacquire other mutations by consuming the number of mutation reacquisitions.
Mutation reacquisitions can be obtained through special mutations or karma effects.

Weapon Purchase Changes

The Challenge REWARD+ feature will be removed.
When purchasing a probability weapon, a more efficient weapon will be provided according to the player's level, and the purchase price will also be changed to increase according to the round.
The Advanced Probability Purchase feature will be removed.

Zombie Z Common Update

The unlock levels for some weapons will be changed.
- Sterling Bayonet: 10 -> 9
- Broad Divine: 14 -> 13
- Drakar-I: 13 -> 14
- Star Chaser SR: 21 -> 22

2023[]

March

Decreased the experience gained when infecting humans with zombies
Changed the intellectual mutation operation method to acquire bonus experience points and changed the in-game description clearly

Zombie Z Season 2[]

As of July 2021, Zombie Z has been updated with new features.

System reorganization

The maximum level has been expanded from 30 to 40!
Damage dealt by zombies, increased dollar compensation for infection
Enhanced zombie play in-game rewards
The part where zombies who received fatal damage did not receive dollars has been fixed, and a common dollar reward is applied to the victim

Mutation Improvement

Mutation enhancement
- Only for the specified mutation among mutations, the performance of the mutation is increased through level system. It can be strengthened by 2. Up to 5 mutations per player can be applied to level system that you can apply/hold with 2.
- By pressing the ‘P’ key, one random mutation that can evolve to Lv.2 among the mutations currently held is converted to Lv. Upgrade to 2. You can check the application/result of the upgrade on the in-game screen, and the player's dollars will be consumed when upgrading.
- Mutation Lv. 2: If you have 5 or more, the Lv. one of the two variants is randomly replaced/updated.
Mutation acceleration system
- Lv. through mutation acceleration. Can temporarily boost the performance of 2 mutations. When you use mutation acceleration, your mutation Lv. The performance of the 2 active mutations (according to faction) is enhanced for 5 seconds.
- Add new mutations and improve existing mutations

Zombie 4: Darkness zombies appear

Weapon purchase process and other gameplay improvements

New weapon recommendation list page by level. Recommended weapons are displayed in the 'Favorites' display area of the existing purchase window.
Improved the “View Recommended Weapons” system: Monthly Zombie Z mode purchases are displayed in order of most purchases.
Improving probabilistic purchasing: Challenge REWARD+ will be added to the probabilistic purchase, and additional rewards will be paid when you achieve a kill with the purchased weapon. Applies only to weapons purchased by clicking ‘Buy Probability (Challenge REWARD+)’ at the beginning of the round.
Advanced probabilistic purchase improvement: Increased usability by reducing the scope for advanced stochastic purchases.
Close purchase window new checkbox: Added an option to turn on/off the purchase window pop-up according to the player's selection.
Display HP bar for attack target: The HP (Health) bar of the enemy is displayed/activated above the head for an enemy that has been hit directly or has had crosshairs for more than 2 seconds.

Mutations[]

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12 December 2024

Icon	Name	Description
	Zombie Booster	When playing as a zombie, gain both zombie and human karma. When playing as a zombie, experience and karma gains increase.
	Patience	After the round starts, weapons cannot be used for a certain period of time. After a while, attack power increases and attacks become possible. Zombies are not affected.
	Unlock Increase	Increases weapon unlock level, but increases attack power. Condition: Always applied, attack power increase.
	Friend	At the start of the round, a random human becomes your friend. When around a human friend, your attack power increases and your health regenerates.
	Self-Growth	Does not level up automatically at the start of a round, but gains mutation reacquisition count at certain levels.
	Resurrection Ticket	If you die as a human, you will be resurrected as a human once instead of becoming a zombie. Condition: When killed by a human.
	Diversity	If the grades of your primary, secondary, melee, and thrown weapons are all different, a critical hit can occur when you attack. If you have a critical hit mutation, the probability and damage of the critical hit are adjusted and increased.
	Bonus	Instantly acquires a random mutation.
	Escape Master	Once per round, when health falls below 50% for the first time, you enter a stealth state for a certain period of time, your movement speed increases, and your health regenerates.
	Vampire	Restores health when dealing damage to an enemy with an attack. There is a cooldown period between activations. Condition: Human only.
	Maturity Saving	You can no longer acquire mutations until you reach the maximum level. When you reach the maximum level, you will acquire mutation points and the number of times you can reacquire mutations equal to the number of rounds that have passed since you acquired the maturity deposit, and all mutation points will be used. The amount of dollars you can acquire for Lv.2 mutations will be changed to 0.
	SMG Master	Increases the attack power of the submachine gun.
	Rifle Master	Increases the damage of the rifle.
	Shotgun Master	Increases the damage of the shotgun.
	Machine Gun Master	Increases the damage of the machine gun.
	Secondary Weapon Master	Primary weapon cannot be used, but secondary weapon attack power increases. Primary weapon purchase and acquisition become impossible.

14 December 2023

Icon	Name	Description (Detail)		Condition
		Human	Zombie
	Sword Master	Every third attack with a melee weapon counts as a backstab attack regardless of where the attack lands.	Reduced Special Attack count for Wind Blast by 1.	Melee weapons and zombie attacks.
Obtained when the [Melee Masher and Claw Enhancement] mutations are max level. Doesn't apply to melee weapons that replace the primary weapon. Only applies to attacks that can make backstab attacks.

	Air Walk	Enables triple jumping and deals damage and stuns nearby enemies upon landing.	Enables triple jumps and pulls nearby humans in upon landing.	Always applied
Obtained when the Kangaroo and Speedy Crouch mutations are at max level.

	Power Glider	Obtain an attack power increase buff based on Icarus gliding time.	Reduced damage and increased Stun and Knockback Resistance while gliding.	Always applied
Obtained when the Icarus and Endurance mutations are at max level.

	Skill Expert	Has a chance to decrease the cooldown of a skill by several seconds when attacking.	Decreased skill cooldown and automatically throw a Zombie Bomb when using a skill.	Always applied
Obtained when the Craftsmanship and Awakening mutations are at max level.

	Destroyer	All attacks have a 100% chance to be a critical strike.		Always applied
Obtained when the Icarus and Endurance mutations are at max level.

	Titan	Obtain an enhanced Contact Infection and greatly increased max HP.		Always applied
Obtained when the Fetch and Regeneration Boost mutations are at max level.

	Rage Bomb	Increased Zombie Bomb damage based on the amount of HP missing.		Always applied
	Hazardous Sprint	Increased Movement Speed based on the amount of HP missing.		Always applied

1 July 2021

Name	Description	Upgradeable
Mutant	Zombie gains another common zombie skill. Skills have a random chance.	No
Furiously Fast	When a zombie's health is below a certain level, movement speed is increased, stiffness and knockback are reduced.	No
Liberator	Creates a stack each time it infects a human. Each stack increases resistance to stiffness, knockback attacks, movement speed, and restores health.	No
Aggressive Investment	Gets a bonus dollar from the infected target. This will be paid in addition to the existing reward.	No
Poisonous Cloud	When a zombie dies, a deadly gas is created. Humans who come into contact with the gas take damage. Zombies can regenerate health when they come into contact with the gas.	No
Hook Bomb	Pull targets damaged by hitting or detonating a zombie bomb a certain distance.	No
Fetch	If you deal damage with a zombie bomb, 1 zombie dog is created.	Yes
Darkness	You can be reborn as a Darkness Zombie. Darkness Zombies have limited performance.	No
Quick Change	Increases weapon swap speed.	Yes
Net Round	Your attack has a low chance to fire a net round. Enemies hit by the grenade are limited to movement for a short time.	Yes
Emergency Escape	Escape from the brink of death and escape into the air. Upon escaping, you become temporarily invincible.	No
Glass Cannon	Instead of just increasing your damage, you also take increased damage.	No
Double Impact	Low chance to apply damage once more.	Yes
Busy Life	Attack power is increased when skills cannot be used. Accelerated mutation and skills during cooldown do not apply.	No
Early Adopter	All unlock levels are reduced by 1.	No
Discount Coupon	All purchases using dollars are discounted.	No

15 January 2021

If a player does not own the "Specialist" mutation at Level 29, there is a 100% chance for the player to own the "Specialist" mutation at Level 30.
The following mutations are added to the mode:

Icon	Name	Description	Level 2 Avaiable
	Painful Memories	For one round, marks the last player who killed you. You'll take less damage from the marked player.	No
	Supply Contamination	Allows you to place Zombie Grenade on human Supply Boxes by pressing E. When a human approaches a bombed supply box, the Zombie Grenade will explode.	No

24 September 2020

Icon	Name	Description	Level 2 Avaiable
	Bomb Defense	Damage and knockback received from zombie bombs is reduced. The reduced damage and knockback is applied to all zombie bombs.	Yes

6 February 2020

~~Added the ability to level down.~~
- ~~The level down button is added to the mutation list window (L key).~~
- ~~1 level goes down as $9000 is spent.~~ (The ability is no longer available.)
If there are no mutations that can be removed, 1 point will be deducted.
The balance of Banshee and Voodoo Zombies has been changed.
- Banshee
  - Damage taken reduced by 70% while using the Pulling skill.
  - Range and pulling force increased for the Pulling skill.
- Voodoo Zombie
  - The Heal skill now recovers 1,400 HP every 1.5 seconds over 6 seconds.
  - Cooldown for the Heal skill adjusted to 14 seconds.
  - Increased amount of HP recovered automatically to 800.
  - Slightly increased Movement Speed.
The weapons obtained from the Season Pass Pass will be enhanced when used in this mode.
- This enhancement effect will be applied till the Season ends.

5 September 2019

Name	Description	Level 2 Avaiable
Intellectual	Gain experience when killing zombies or infecting humans.	No
Zombie Bomb Giveaway	Receive a zombie bomb in every round.	No
Revenge	Automatically throw a zombie bomb in the direction you look before dying as a zombie.	Yes

4 April 2019

You can purchase recommended weapons directly from the Buy menu.
Special weapons such as season weapons can be purchased directly, but they have been changed so that they can not be used as random weapons.
Mutation acquisition motion time has been reduced (can be used while moving).
The mutation value has been changed to keep the same room when reconnecting.
Mutation error (double jump recognition) has been fixed.

13 December 2018

Name	Description	Level 2 Avaiable
Icarus	You can jump high and glide in the air for a short period of time. (2 seconds for the cooldown time)	No
Penetrating Rounds	The penetration rate of the shot is increased. The effect can not be applied to firearms that can not penetrate.	No
Elite	As the number of humans decreases, the damage and movement rate increases.	No
Purchasing Power	The more dollars you have, the more damage you do.	No
Craftsmanship	When you use the same firearm continuously, the damage of the firearm increases. (Based on weapons when zombies appeared)	Yes
Life Plunder	When you infected a human, you and your allies will recover HP.	No
Bomb Enhacement	Zombie bomb damage and knockback increases.	Yes
Claw Enhacement	The general attack range of zombies increases.	No
Skill Evolution	Zombie skill reuse time is reduced.	No
Steel Skin	When hit, there is a chance to bounce the bullet to avoid damage.	Yes

All

Name	Description	Level 2 Avaiable
Money Grubber	Earn extra dollars at the start of the round. It is provided separately from the dollar rewards resulting from the combat.	Yes
Cheetah	Movement speed increases. The additional movement speed is not affected by the weight.	Yes
Kangaroo	Increases the jump power. The additional jump force is not affected by gravity.	Yes
Regeneration Boost	Recovery ability is improved. It is applied separately from the basic recovery ability.	Yes
Huntier's Instinct	Target targets within range periodically. Your combat ability against your target opponent is greatly increased.	Yes
Double Jump	You can jump twice in the air.	Yes
HP Boost	Increases maximum health.	No
Heroic Presence	There is a possibility to be chosen as a hero.	No
Fanatic	You become stronger through battle and cooperation. Activates morale boost for human, rage bar for zombie.	No

Human

Name	Description	Level 2 Avaiable
Melee Masher	When you use a melee weapon, your combat power is improved. Apart from the weapon's ability to use, it creates a powerful explosion at long range, giving the enemy big damage, knockback, and stun.	Yes
Ammo Reserves	Increases the amount of ammo of the weapon. When reached a certain level, it will be able to shoot the weapon's endlessly.	No
Rapid Reloader	The reloading speed of the weapon decreases. If the loading speed is faster than a certain value, automatic loading is activated, which means that the shot is not fired but fires instantly from the reserved ammo.	No
Stealth Reloader	The body becomes transparent when it is in the state of stealth when you are reloading. If you attack, the stealth state will be canceled immediately. Cooldown time applies as soon as the stun effect is triggered.	No
Focused Breakthrough	Moving an assault rifle forward with your hands. It will improve your combat ability every second. Improvement width is as follows.	Yes
Booster	Movement speed increases when equipped with submachine guns, and is subject to additional acceleration periodically. The additional acceleration effect is maintained only for a short time.	Yes
Ammo Creation	When reloading, there is a certain probability that more bullets will be loaded. The additional amount increases in proportion to the current loading amount, and this shot can be loaded beyond the maximum limit of the magazine.	Yes
Explosive Ammo	An explosion occurs every time a certain amount of shot is fired. Explosion changes in proportion to weapon damage.	Yes
Incendiary Ammo	When you hit an enemy with a sniper rifle, there is a certain probability to set the enemy on fire. The enemy will suffer damage every second and the movement speed will decrease.	Yes
Marksman	When using a sniper rifle, the shot will hit the center of the sight line unconditionally.	No
Sixth Sense	You can detect the appearance of a zombie host. You can detect when zombie hosts appear within a certain range. You can also tell if you yourself are a zombie host.	No
Specialist	Human special skills are activated.	No
Drop Zone	When attacking an enemy hanging on a ladder, forcefully drop them from the ladder.	No
Vaccination Blaster	The smoke bomb will be changed to a zombie-compatible vaccine. Also, the round starts with the vaccine shot.	Yes
Bomber's Pack	Automatically generate grenades at regular intervals.	No
Support Bombardment	When a grenade explodes, there is a low probability of bombing at that location.	No
Critical Strike	A low chance of a critical strike. Also, the lower the fire performance of the weapon, the greater the chance of a critical strike.	Yes
Tempered Ammo	The power of the gun increases. Additional damage is applied to each bullet.	No
Rapid-Fire Ammo	When throwing a grenade, the same kind of grenade is automatically thrown.	No
Fireball	The use of sniper rifles causes a strong explosion in close range. This explosion causes great damage to the enemy.	Yes
Frost Blaster	Replace flashbang with Nitrogen Grenade that can freeze and knock zombies away in a short period of time when exploded. A new grenade will be issued at the beginning of each round.	No

Zombie

Name	Description	Level 2 Avaiable
Gene Booster	Instantly become a host zombie when infected. Evolution is possible even without enthusiasm.	No
Endurance	Have a chance to ignore stun and knockback when hit (the damage is not alleviated).	Yes
Contact Infection	Deals damages to the humans nearby per second. The later the round, the higher the damage.	No
Resucitation	Earn resurrection ability. Even after the virus is decrypted, You can be resurrected in case of death. However, if you die in head shot, you can not resurrect.	No
Steel Body	Increases your armor.	Yes
Speedy Crouch	The speed increases when you sit and move.	Yes
Steel Head	Reduces headshot damage.	Yes
Adaptability	You can change the zombie class at any time by using the class change key (default [M] key). However, when you change a zombie class, your health decreases.	Yes
Explosive Reaction	If you suffer a certain amount of damage, you will create a zombie bomb. Zombie bombs generated through mutations can be acquired beyond their possession limits.	No
Armored Advance	When you move slowly, your armor increases.	Yes