14 December 2023[]
- Applied Lab Mode effect to Zombie Z (Karma change, Hero/Sidekick effect change)
- New Zombie Z Mutation: [Rage Bomb], [Crisis Movement]
- Zombie Z weapon level unlock change
- Applied Zombie skill enhance by number of rounds (Zombie Z only)
- Applied lobby font outline effect
- Vampiric Part System balance adjustment
- Various system reorganization
- CSO Creator Partner Season 6
- CSO Grand Fest Season 3 open application
- Farewell 2023 event
- Added Christmas BGM lobby item
- Added [Solo-unit Battalion Commander] medal
- Held Find the Zombies event
- Held [Pligrim] Nameplate event
- Z-Box webpage event
- New Year hot time event
- New Year lucky draw event
- New/Returning users event reorganization
- Daily Login renewal
- Various bug fixes
30 November 2023[]
- Recruited Idol Shiho and Idol Miho
- Adopted AK-47 60R Classic
- Resold Quantum Horizon, Void Avenger, Supreme Sentinel, Lightning Fury, Spell Lance Scarlet Rose, M2HB Devastator, Satellite Mine, Mirage, Anemone, Ishmael, Ethan, Roy, and Romi in All-In-One Box
- Resold Hauteclere in Transcendence Decoder
- Held Mileage Auction
- Added Spell Lance Scarlet Rose to Mileage Auction
16 November 2023[]
- Reopened Metal Arena mode
- Replaced Newcomen with Rock Breaker in Gun Deathmatch
- Updated Studio (mode)
- Increased maximum map holding limit to 12
- Addition of background music block transmission function (Zombie Scenario: Season 8 Music)
- Added ghost setting in player setting effect (Added area trigger check function even in ghost mode)
- Added speed setting (X5 option added)
- Added new weapons in Weapon Spawner device (M2, MP40, M1 Garand, M1918 BAR, M1911 A1)
- Added a skip function to the cutscene camera device block (if the option is checked, the cutscene will not be skipped until the end)
- Added class radio voice blocking function
- Added Short Enhancement Effect function
- Added Night Vision Effect save function
- Updated Bots to support more weapons, costumes and zombie skins
- Added 9 new medals
- Expanded Honor score (more colors)
- Adopted Supreme Sentinel
- Fixed various bugs
2 November 2023[]
- Added Miracle Prism Sword Moonlight Paint
- Held Random Weapon Zombie Hero event
- Added Drakar-I, Drakar-II, Drakar-III, IGNITE-10, Twin Light Axes, M249 Ra, Dual Katana Anubis, Sapientia Anubis, Thunderbolt Anubis
- Added Estate
- Adopted Photon Launcher
- Resold Skadi and Nyx
- Updated Transcendent Decoder
- Replaced AUG Guardian with Negev NG-7 Ajax
- Fixed various bugs
19 October 2023[]
- Released Cordon
- Added [Fitness Club] theme to the Studio (mode)
- Updated Lab Mode
- Updated Zombie Z Weapon Unlock level
- Replaced AUG Guardian with Negev NG-7 Ajax in Transcendent Decoder
5 October 2023[]
- Installed Part System to Star Chaser AR
- Held Random Rule Zombie Hero
- Recruited Queen Ishmael and Deacon Faust
- Resold Failnaught and Hellhound
- Added Leader Soi and Super Soldier Jennifer permanently to Class Decoder
21 September 2023[]
- Released Extension
- Held 2023 Season 17: Egypt
- Held League Season 13
- Renewed Family Bonus
- Held Mileage Auction
- Added Dragon Knight Kyrix and High Elf Natasha
- Resold Twin Shadow Axes and Cyclops
- Updated Unique Decoder
- Added IGNITE-10
- Removed M32 MGL Venom
- Adopted Twin Light Axes
- Fixed various bugs
7 September 2023[]
- Adopted IGINITE-10
- Released Isolation
- Added Part System support for Grenades
- Added Bomb Boost and Bomb Self Shield parts
- Held Collection of new semester name stickers! and Season double badge events
- Held Bonus Disassembly
- Fixed various bugs
24 August 2023[]
- Updated Firebomb
- Added [Space Rift] Overflow medal
- Updated Super Soldier
- Added Drakar Decoder and Drakar Coin
- Adopted Drakar-I, Drakar-II and Drakar-III
- Class Decoder New Rotation: Ishmael/Ethan/Roy/Romi
10 August 2023[]
- Released Overflow
- Added [Season 8 Veteran] medal
- Added [Pink Chilseok] paint
- Updated notification window and Lab Mode
- Added more weapons to Desert Weapon Selection Box:
- Barrett M95 Desert
- Dual Infinity Final Desert
- M60E4 Desert
- Held Liberation Day 78th Anniversary, Chilseok Puzzle Collection Event and Collect Points and Beat the Heat! Events
- Held Mileage Auction
- Fixed various bugs
27 July 2023[]
- Held Random Weapon Zombie Hero Event
- Held Ad Balloon Popping Event
- Added Part System to Star Chaser SR
- Held Water Balloon Grenade kill event (Heat Wave Targets) and Zombie Balloon events
- Resold Death Eater
- Resold Immortal Eric and Smile Mary
13 July 2023[]
- Adopted Dive Repulsor and M3 Azidahaka
- Unleashed Resonance Energy
- Resold Epic Decoder
- Added Desert Weapon Selection Box
- Held Mileage Auction
- Added Negev NG-7 Ajax and Eternity Laser Fist
29 June 2023[]
- Patched Super Soldier
- Updated Zombie Hero and Zombie Z
- Added 2 new Zombie Scenario medals
- Adopted Demolition Hammer
- Held Bonus Disassembly event
- Resold M2HB Devastator
- Updated Class Decoder
- Rotation Group: Anemone, Mirage, Roy, Romi
- Added Boss David Black and Special Agent Criss
- Updated Unique Decoder
- Replaced Rail Buster with IGNITE-7
15 June 2023[]
- Held Rice Grenade grenade kill event
- Held Find the Zombies
- Adopted IGNITE-7
- Updated Breeze
- Fixed various bugs
1 June 2023[]
- Released Breeze
- Updated Lab Mode
- Held 2023 Season 16
- Held League Season 12
- Added [Pet] slot
- Held Mileage Auction
- Recruited Blue Rabbit Mirage and Alpaca Anemone
- Updated Transcendence Decoder
- Added Psychic Harmonium
- Downgraded Dual Sword Phantom Slayer
- Removed M249 Phoenix
- Fixed various bugs
18 May 2023[]
- Held Teddy Terror Nightmare event
- Added +8 enhancement to Double-barreled shotgun
- Added Part System to Stun Rifle
- Held Mileage Auction
4 May 2023[]
- Released Estate (Kindergarten) at all times
- Rereleased Castle Land
- Adjusted Firebomb in Zombie 3: Hero and Zombie Z
- Adjusted Evolution ability in Zombie 2: Mutation
- Held Random Rule Zombie Hero event
- Held Mosquitoes event
- Adopted Tyrant Mace
- Updated Battlefield Supply
- Fixed various bugs
20 April 2023[]
- Held Mileage Auction
- Added Ishmael, Ethan, Anemone, Mirage to Rotation group of Class Decoder
6 April 2023[]
- Added Zombie Z to Lab Mode
- Updated Studio (mode)
- Released [Yuri's Secret Aquarium] map
- Released Underwater Theme Blocks
- Held #Underwater Studio Contest
- Held Rebound Partnership Commemorative Event: Basketball grenade payment
- Held Bonus Disassembly event
- Added Arbalest, Hecate II Umbra, Custos, Doom Blaster
- Resold Epic Decoder
- Adopted Doom Blaster
- Resold Divine Blaster, Negev NG-7 Ajax, Spell Lance Scarlet Rose, Lightning Fury, Psychic Harmonium
- Resold Premium Transcendent Decoder
- Resold Satellite Mine and FN57 Laevatein
- Added Epic Pass, Transcendent Pass and Class Pass
- Minor updates
- Reduced the required number of players for events from 4 to 3
- Increase self ban limit from 200 to 250
- Stopped the support for Windows XP
- Changed the hardware acceleration feature to default on
- Fixed Whip Sword bug
- Fixed various bugs
23 March 2023[]
- Held April Fool event
- Recruited Special Agent Mei and Bomb Maniac Yuri
- Changed level of Custos 40 → 37 in Zombie Z mode
- Changed Custos' purchase price from 15,000 → 12,000 inZombie Z mode
- Fixed some auto aim weapons not attacking firebombs
- Fixed the amount of karma obtained when killing/assisting a zombie
- Fixed a problem where the client crashed with a low probability or was moved to the waiting room during play
9 March 2023[]
- Updated Zombie Scenario, Zombie Hero, Zombie Z, Zombie Classic and Zombie Mutant
- Added BGM Playlist, mission group and search function
- Held Seed event
- Adopted Coustos
- Updated Battlefield Supply
- Fixed various bugs
- Removed Rail Cannon from Unique Decoder
23 February 2023[]
- Held Mileage Auction
- Resold Kai and Lynn
- Adopted Electron-V
9 February 2023[]
- Released Abandoned Hound
- Held 2023 Season 15
- Held League Season 11
- Fixed Zombie Scenario, Zombie Classic and Zombie Mutant
- Held Valentine
- Resold Whip Sword
- Fixed various bugs
26 January 2023[]
- Arbalest Changes
- Fixed the situation where basic attacks are blocked by allies.
- Adjusted the cosmic black hole charging time shorter than before.
- Fixed an issue where the gun sound continued to play when using Cosmic Wave and Emotion together.
- Held Random Weapon Zombie Hero and Zombie Classic
- Added new rotation for Transcendent Decoder: Demonic Scarlet Rose/Satellite Mine/Negev NG-7 Ajax/Lightning Fury
- Resold Pop Star Alin and Agent Ritsuka
19 January 2023[]
- Arbalest performance change
- Increased the frequency of basic attack explosions.
- Increased basic attack explosion range.
- Increased attack range around Cosmic Wave.
- Cosmic wave zombie damage increased.
- Increased special ammo charging speed.
- Added cancellation of slow effect when Cosmic Armor is activated.
- Arbalest improvements and bug fixes
- Optimized basic attack explosion effect.
- Fixed the problem of HUD UI disappearing when using Emotion.
- Fixed an issue where gun models looked strange in third person.
- Fixed an issue where the cosmic wave sounds incorrectly in 3rd person.
- Fixed an issue where bullet marks looked abnormal.
- Hecate II Umbra attack has been modified so that it penetrates the scenario boss.
- Fixed various bugs
12 January 2023[]
- Adopted Arbalest and Hecate II Umbra
- Held Star Fragment event
- Updated Weapon Enhancement
- Added Battle Ultimax 100 +8
- Added Battle PJ MK3A1 +8
- Held New Year events
- Held Stingray Kite event
- Held Mileage Auction
- Added Psychic Harmonium
- Sold Epic Decoder 3 stage discount package (total -25%/50 decoder)
- Updated Battlefield Supply
- Added Battle Ultimax-100 to Rare Decoder
- Distributed Studio Trophy to the winners
- Discontinued Kingdom affiliate content distribution
- Replaced of resources for NPCs related to Studio Kingdom
- Removed Researcher's Journal Abduction Joseon map
- Modified Twin Hawk
- Increased left-click attack range
- Added last bullet shock wave damage and increased range
- Zombie Z level 30 → changed to level 27
- Modified Hauteclere: Fixed issue Blade Tempest's last attack did not knock back some zombies
- Fixed various bugs
2023[]
29 December 2022[]
- Held Random Weapon Zombie Classic
- Updated Mission Chain
- Adopted Twin Hawk
- Held Bonus Disassembly and Winter Festival events
- Added [Black Neon] paint
15 December 2022[]
- Updated Zombie Conquest
- Held Snowflakes
- Held Christmas Golden Key event
- Held Hot Time event
- Held Christmas event
- Adopted Haute Claire
- Updated Battlefield Supply
- Added Pink Heart Shiho, Black Rose Miho, Queen, Cyborg, Private Erica, Drill Instructor Gerard to Event Decoder
- Fixed various bugs
1 December 2022[]
- Rebalanced Zombie Lab Mode
- New skill addition and system change
- Knockback and stun reduction when host zombies appear
- HP recovery function added according to human morale charge level
- New human skill 'HP Recovery'
- Karma system deleted
- Updated Zombie Z
- Weapon level change
- EXP change
- Changed challenge reward
- Recruited CS Partner Season 4 Influencer
- Held Laboratory Experience and 2022 Global Costume Giveaway events
- Released Fan Costumes
- Fixed various bugs
17 November 2022[]
- Released Sky Garden
- Improved Zombie Conquest
- Improved game
- Introduced automatic play function to find zombies
- Improved animation spray
- Added registration effect when editing inventory weapon/class/zombie order
- Expanded number of zombie classic studio mode (32 persons)
- Added +5 Weapon Enhancement for CROW-7 and SKULL-6
- Held Find the Zombies, Marksman Training Project! and Mileage Auction events
- Recruited Skadi and Nyx
- Updated Transcendent Decoder Rotation Group:
- Updated Zombie Beginner Weapon Set
10 November 2022[]
- Added M60E4 Maverick, Battle Python and SPAS-12 Maverick to Weapon Enhancement +8
- Held Lantern event
- Rare prize: Sterling Bayonet (Permanent/Bound)
- Modified Cyclops
20 October 2022[]
- Held 2022 Season 14
- Held League Season 10
- Released Abyss2 Halloween
- Updated Studio (mode)
- Added 24 devices, 2 characters, 22 decorations
- Changed transport and barbed wall trap blocks
- Ranking Board: A lap time item is added.
- Held Studio Contest
- Held Halloween event
- Held Four Rules of Remembrance Event for Jiang Shi
- Adopted Cyclops
- Resold Roy and Romi
- Updated Battlefield Supply
- Updated Zombie Scenario
- Fixed various bugs
6 October 2022[]
- Held Special Mileage Auction
- Held Random Ruler Zombie Hero event
- Held Fall Leaves Box Dispensing Event
- Held Fall Leaves Box Cumulative Event
- Held Have fun again, the routine of the day! event
- Held Good-Bye Season 13 Season Badge Double Up Event
- Added new rotation for Class Decoder: Dragon Knight Kyrix, High Elf Natasha, Anemone, Mirage
- held Class Decoder Rotation Group Confirmation Payment Event
22 September 2022[]
- Released Neon City
- Added Inventory Lock System
- Simplified Weapon Enhancement
- Added more weapons for enhancement: MK48 (+8), M4A1 Shadow Knight (+9), AK-47 Royal Knight (+9) and Warhammer Blood Lord (+6)
- Fixed player model rigging
- You can now press ESC if stuck in Zombie Scenario
- Added Trinity Grenade to Mileage Auction
- New Rotations in Transcendent Decoder: Negev NG-7 Ajax, Demonic Scarlet Rose, Lightning Fury, Psychic Harmonium
- Added Magnum Launcher and removed Gáe Bolg from Transcendent Decoder
- Updated Battlefield Supply
- Fixed various bugs
8 September 2022[]
- Held Mileage Auction
- Added Failnaught Special Event Auction
- Held Random Zombie 3: Hero Event
- Held Mystery Box Fragment Collection Event
- Held Bonus Disassembly
- Resold Ishmael and Ethan
- Updated Battlefield Supply
25 August 2022[]
- Patched Zombie Scenario Ability Event Mode
- Improved VIP system
- Updated Zombie Conquest
- Resold Failnaught
- Fixed various bugs
11 August 2022[]
- Held Mileage Auction
- Added Class Auction
- Recruited Immortal Eric and Smile Mary
- Updated Class Decoder content
- Removed Isabelle, Gerard, David Black, Arin
- Updated Zombie Conquest content
- Changed Keith Icahn, Spade and Blair from cash to points (Permanent to 30 days)
- Updated M60E4 Gold's model
- Updated Mileage Duffel Bag
28 July 2022[]
- Patched Zombie Conquest
- Released Hacienda
- Held Zombie Conquest League Season 1
- Extended Mileage Auction
- Added new medals: [Protector] & [Master of Combination]
- Held Bonus Disassembly
- New rotation weapons in Transcendence Decoder: Negev NG-7 Ajax / Trinity Grenade / Psychic Harmonium / Lightning Fury
- Added X-TRACKER and removed SG552 Lycanthrope from Transcendence Decoder
- Buffed Sandalphon and Gigantic Drill
- Fixed various bugs
14 July 2022[]
- Resold Epic Decoder
- Adopted Sandalphon, Gigantic Drill and Dark Star
- Held Guardian Light event
- Released Italy (Santorini)
- Infinity Laser Fist and Eternity Laser Fist can be now undergo Weapon Enhancement +5
- SKULL-7 and BALROG-VII can now undergo Weapon Enhancement +5
- Renewed Continuous Mission Guide System
- Updated New Classic (Zombie) Weapon restricion
- Extended Mileage Auction
- Held Mosquitoes event
- Fixed various bugs
30 June 2022[]
- Held 2022 Season 13
- Held League Season 9
- Held CSO Partner Season 3 Creator Recruitment
- Adopted Laser Ripper
- Held Mileage Auction
- Added Miracle Prism Sword
- Updated Class Decoder
- Rotation: Boss David Black/Special Agent Criss/Leader Soi/Super Soldier Jennifer
- Permanent: Private Erica Instructor Gerard
16 June 2022[]
- Patched Studio Zombie 1: Original
- Discovered Nostalgia
- Added [Negotiator], [Season 7 Pilgrim], and [Look Into My Eyes] medals
- Held Zombie Balloon event
- Held Good-Bye Season 12 Season Badge Double Up Event
- Adopted Death Eater
- Held Bonus Disassembly event
2 June 2022[]
19 May 2022[]
- Added New Classic (Zombie) Weapon Restriction
- Held Teddy Terror event
- Held Global Costume Design Contest
- Recruited Kai and Lynn
- Updated Battlefield Supply
- Fixed various bugs
5 May 2022[]
- Released Castle Land and Estate (Kindergarten)
- Extended Mileage Auction
- Held Bigger and Better Gift Box and One More Time Daily Routines events
- Resold Dragon Knight Kyrix and High Elf Natasha
- Added Pink Heart Shiho, Black Rose Miho, Queen, Cyborg permanently in Class Decoder
21 April 2022[]
- Patched [Protection] event mode to Zombie Hero
- Renewed Internet Cafe benefits
- Added Weapon Cooldown restriction in regular Zombie modes
- Updated Zombie Z Weapon Unlock Levels
- Held Mileage Auction event
- Added X-TRACKER
- Special event: Auction House Weapon Lottery + Decoders
- Updated prizes for New/Return Players
- Held Spring Winds Bring Spring Flower Boxes Event
- Adopted Whip Sword
- Added Class Rotation to the Class Decoder
- Classes: Private Erica / Drill Instructor Gerard / Leader Soi / Super Soldier Jennifer
- Added more paints to the Mileage Shop
- Fixed various bugs
14 April 2022[]
- Re-Ajusted Event Box rewards from Event reward boxes are pouring out on weekdays and weekends! event
- Fixed some bugs
7 April 2022[]
- Added FG-Launcher and Papin to Part System
- Updated FG-Launcher's damage
- Held Event reward boxes are pouring out on weekdays and weekends! event
- Held Bonus Disassembly
31 March 2022[]
- Fiexed various bugs
- Re-Added Hardware Acceleration setting
24 March 2022[]
- Held 2022 Season 12 event
- Held League Rank Season 8.
- Updated Lab Mode, Competitive War & Zombie Z
- Held Seed event
- Resold M2 Devastator, Anemone & Mirage
Added Hardware Acceleration setting(Recalled due to a bug)
10 March 2022[]
- Held Random Rule Zombie Hero
- Held Doubled Season Pass Badge and Play event for the New Semester events
- Resold Satellite Mine
- Improved Petrol Boomer and Batista performance
- Added Part System to both weapons
- Increased damage in Zombie and Scenario modes
- Updated their Zombie Z levels
24 February 2022[]
- Patched Lab Mode
- Updated Competitive War and Zombie Z
- Released [Crystal Cave] (Studio Zombie Escape)
- Held Studio Mining Theme Contest
- Recruited Agent Ritsuka and Pop Star Alin
10 February 2022[]
- Released Upcoming Threat
- Held Hot Time Power Energy Giveaway
- Held Valentine event
- Held Heart Grenade Event
- Held Chocolate Box Collection Event
- Held Mileage Auction event
- Added Magnum Launcher
- Held Mix & Match Set 7000 Mileage
- Fixed various bugs
27 January 2022[]
- Held Random Zombie Hero event
- New weapons: Quantum Horizon, Psychic Sizer, Failnaught, Laevatein, Mechasaurus MK-4, Gear Bird Cannon MK-3 and SG552 Cerberus
- Event destination maps: Assault, Italy, Dust
- The CSO Director's Small New Year's Gift rewards
- Gave one of each of the following decoders + 2022 Mileage: Rare Decoder, Unique Decoder, Transcendence Decoder, Point Transcendence Decoder, Class Decoder, Class Point Decoder, Epic Decoder, Event Decoder
- Improved Quantum Horizon performance
- Fixed various bugs
20 January 2022[]
- Updated Competitive match for Zombie modes
- Released Cargo Ship
- Updated Zombie Z with new unlock level and some mutation adjustments
- Renewed Continuous Mission System
- Held Stingray Kite, Bonus Disassembly, CSO22 Paint Giveaway and Mileage Auction events
- Updated Battlefield Supply
- Fixed various bugs, noticeably Abyss2 and Episode Victor spawn bugs
- Released Zombie Damage Meter
- Adopted Quantum Horizon and Psychic Sizer
- Held Power Energy event
6 January 2022[]
- Improved SKULL-T9 performance
- Increased Range, B mode damage, Rate of Fire and portability
- Readjusted its Zombie Z level
- Fixed some bugs
2022[]
30 December 2021[]
- Held Mileage Auction
- Added Infinity Laser Fist
- Adopted SKULL-T9
- Added Private Erica, Drill Instructor Gerard, Boss David Black and Special Agent Criss to Rotation group in Class Decoder
16 December 2021[]
- Released Skyscraper (Xmas)
- Rereleased Italy (Xmas)
- Added [Competitive] rules for Zombie Hero and Zombie Z modes
- Added Harbor
- Held 2021 Season 11
- Held League Season 7
- Updated Zombie content
- Improved Family system
- Held Christmas event
- Held New/Returning plaers welcome attendance and Adieu 2021 ! Snowflake Collection events
- Resold Magnum Launcher, Trinity Grenade, X-TRACKER and Lightning Fury to Rotation group in Transcendence Decoder
- Resold Leader Soi and Super Soldier Jennifer
- Added Aetheris, Axion, Medea and Kal-el permanently into Class Decoder
- Added Point Transcendence Decoder and Point Class Decoder
- Removed Rare grade weapons from Transcendence Decoder and Event Decoder
2 December 2021[]
- Added Part System to Green Dragon Blade and SKULL-11
- Unlocked Blade Frostbreaker for +5 Weapon Enhancement
- Held Find the Zombies event
- Resold Demonic Scarlet Rose
- Held Let's spend the year-end together! and Let's run together! events
- Replaced Magnum Drill with Infinity Laser Fist in Transcendence Decoder
18 November 2021[]
- Added [Random Transformation] Zombie Scenario event for Paranoia and Lowdown
- Released Void Zone
- Improved Expedition and Family systems
- Held Mission Clear and Playtime Pileup events
- Recruited Roy and Romi
- Fixed various bugs
11 November 2021[]
- Extended Mileage Auction period by one more week
- Fixed various bugs
4 November 2021[]
- Improved Plasma Gun and SKULL-1 performance
- Added Part System to both weapons
- Increased damage in Zombie (Plasma Gun only) and Scenario (Plasma Gun and SKULL-1) modes
- Updated their Zombie Z levels
- Held Mileage Auction
- Added Dual Beretta Gunslinger
- Held 1111 Mileage Special Auction Event
- Resold Negev NG-7 Ajax
- Added Dual Beretta Gunslinger permanently to Transcendence Decoder
- Removed Desert Eagle Crimson Hunter from Transcendence Decoder
- Held 1+1=11 Let's Get Together and Special Mission Completion events
- Re-added and updated Experience Up
- Updated and resold Zombie Z Starter Package
21 October 2021[]
- Improved Zombie Escape
- Released [Remains] Studio Zombie Escape map
- Added Jungle theme blocks
- Held Studio Jungle Theme Contest
- Released Vertigo Halloween
- Rereleased Assault Halloween
- Adopted Laevatein
- Held Bonus Disassembly
- Held Halloween event
- Added Halloween Nameplate
- Held Pumpkin grenade and pumpkin head consume events
- Held Halloween Basket Collection event
- Updated Battlefield Supply
- Fixed various bugs
7 October 2021[]
- Held Random Rule Zombie Hero
- Held Autumn Leaves Box Collection event
- Added Autumn Leaves Nameplate
- Added Transcendence Enhanced Weapon Selection Box
- Added 50 EXP Weapon Enhancement EXP Coupon
30 September 2021[]
- Improved Failnaught perfomance
- Added Class Voice Emphasis to Audio Options
- Fixed various bugs
16 September 2021[]
- Released Electron
- Added Class Change feature: Press [H] to change your class next round
- Held Fireworks Crafting Festival! and Gather Sky Lanterns and Get Rewards! events
- Added Night Sea Nameplate
- Held Mileage Auction
- Adopted Failnaught
- Recruited Ishmael and Ethan
- Fixed various bugs
9 September 2021[]
- Held Full Moon event
- Hunter Killer X-7 (Gun Boost 6, Rage Down 6) as the top prize
26 August 2021[]
- Held 2021 Season 10 event
- Added [CSO Brand Hip Color] costume to Black Market
- Adopted Gear Bird Cannon MK-1, Gear Bird Cannon MK-2, Gear Bird Cannon MK-3, and Grand Bird Cannon
- Held League Season 6
- Adopted SG552 Cerberus
- Held SG552 Cerberus Collection Event
12 August 2021[]
- Held Random Zombie Hero event
- New weapons: Blaze Nova, Twin Shadow Axes, Astra, Satellite Mine, Blue Storm, M2 Devastator, Elemental Tracker,
MG4 - Event destination maps: Assault, Italy, Dust
- New weapons: Blaze Nova, Twin Shadow Axes, Astra, Satellite Mine, Blue Storm, M2 Devastator, Elemental Tracker,
- Held JANUS Is Back event
29 July 2021[]
- Released Lowdown
- Updated Studio Play:
- Added Level and Difficulty rules
- Added Cutscene Camera device
- Expanded Ranking Board function
- Released Researcher Journal #7: Tracking
- Held Studio Zombie Scenario Contest
- Improved info accessibility and user convenience
- Changed Playroom to Zombie Z Base
- Updated Encyclopedia
- Consolidated Event/Season Missions
- Added Mission Chain feature
- Rebalanced Zombie Z Season 2
- Updated Battlefield Supply
- Fixed various bugs
15 July 2021[]
- Resold Epic Decoder
- Adopted Dual Dark Spirit and Astra
- Resold Dual Beretta Gunslinger, Trinity Grenade, X-TRACKER, Infinity Laser Fist and Eternity Laser Fist
- Held Dark Shard event
- Held Bonus Disassembly event
8 July 2021[]
- Improved Magnum Shooter perfomance
- Added additional information about Purchase Request system in Mileage Auction
- Fixed various bugs
6 July 2021[]
- Adjusted some weapon levels in Zombie Z
1 July 2021[]
- Updated Zombie Z Season 2
- Held Mileage Auction
- Added Price Request System
- Added Starlight Rolling Shooter
- Updated Settlement Support Weapon Box
- Adopted Magnum Shooter
- Recruited Anemone and Mirage (Character)
- Updated Battlefield Supply
17 June 2021[]
- Added +5 Weapon Enhancement for Air Burster, Battle PP-19 Bizon and Cyclone
- Resold Boss David Black, Special Agent Criss and their costumes
- Updated Transcendent Life Weapon Box and Zombie Z Starter Package
- Held Special Summer Reward Giveaway
- Main Rewards: 500 Mileage, Unique Decoder, and Transcendence Decoder (1 per day)
- Special Rewards: Hunter Killer X-12, Gun Boost lvl 5 and Gun Boost lvl 6
3 June 2021[]
- Released [Medieval Fortress] Studio Zombie map
- Updated Studio and Hide and Seek device blocks
- Held Studio Medieval Theme Contest
- Adjusted some weapon levels in Zombie Z
- Play Studio Creation mode for 30 minutes to get all Studio Theme Packs for free
- Adopted M2 Devastator
- Held CSO Event Ticket and Transcendent Chest events
- Updated Battlefield Supply
- Fixed various bugs
20 May 2021[]
- Rereleased Dust CSO Land
- Opened +5 Weapon Enhancement for Flame Jackhammer, Rail Buster, Tornado and Hunter Killer X-15
- Added Flame Jackhammer, Rail Buster and Tornado to Unique Decoder
- Removed Star Chaser AR, Bouncer and Stun Rifle from Unique Decoder
- Updated Event Decoder content
- Held CSO Land Play event
- Resold Lightning Fury
- Adopted Blue Storm
- Open 300 Transcendence Decoder and/or 50 Premium Transcendence Decoder to obtain one of the weapons permanently
6 May 2021[]
- Held 2021 Season 9: Fantasy World
- Reorganized some features
- Held League Season 5
- Updated zombie content
- Improved Inventory system
- Updated Battlefield Supply
- Fixed various bugs
22 April 2021[]
- Added THANATOS Series to Weapon Enhancement +5
- Adopted Blaze Nova
- Resold Dread Nova and Epic Decoder
- Held Mileage Auction
- Added Shining Heart Rod
- Expanded inventory limit
- Fixed various bugs
8 April 2021[]
- Reorganized Daily Missions
- Introduced Black Market
- Second additional improvement for Zombie Scenario
- Added Abyss difficulty for Zombie Scenario
- Updated Zombie mode
- Recruited Kyrix the Brave and High Elf Natasha
- Updated Battlefield Supply
- Fixed various bugs
25 March 2021[]
- Replaced Blood Dripper with Thunder Ghost Walker in Transcendence Decoder
- Adopted Satellite Mine
- Held Seed event
- Held Zombie Hero Random Rule event
- Recovered an add-on item that was used irrespective of the intent due to a system error
- Modified the maximum enhancement value of M95 Christmas damage from 1 to 2.
- Modified the maximum enhancement value of the VICTORY series weapon enhancement items (Damage, Accuracy, Recoil, Weight, Continuous fire, and Number of rounds) to 5.
11 March 2021[]
- Held Zombie Scenario League Season 4 Event
- Held CS Online Tutorial Video Contest
- Additional improvement on Zombie Scenario
- Brick Piece S1451, Hunter Killer X-7, Hunter Killer X-45 and Rail Cannon can now undergo +5 Weapon Enhancement
- Reworked some weapon level in Zombie Z
- Held Random Weapon Zombie Hero event
- Added [Security System] and [Happy New Year] medals
- Updated Battlefield Supply
- Added Weapon Enhancement EXP Coupon
- Fixed various bugs
25 February 2021[]
- Added Inferno difficulty to Memories
- Held Valentine and Candy events
- Resold Private Erica and Drill Instructor Gerard
11 February 2021[]
- Held Mileage Auction
- Added Thunder Ghost Walker and Dual Sword Hellfire
4 February 2021[]
- Held Letter Collecting Event
- Resold Epic Decoder
- Added Divine Blaster and Thunder Force
- Resold Dual Beretta Gunslinger, Trinity Grenade, X-TRACKER, Infinity Laser Fist and Eternity Laser Fist in Epic Decoder
- Held Divine Fragment event
- Released Rex Labs
- Reworked Zombie Scenario
- Updated Zombie content
- Renewed Hero and Sidekick weapons
- Expanded Inventory by 100
- Updated prizes for new/returning players
- Compensated old Zombie Scenario items
- Held Stingray Kite event
- Held Bonus Disassembly event
- Updated Battlefield Supply
- Fixed various bugs
14 January 2021[]
- Held 2021 Season 8 Event
- Held Zombie League Season 3 Event
- Updated Zombie modes with new contents
- Zombie-only boosting items
- Death information window and Revenge bonus system
- Zombie-only new mutation
- Zombie Z Improvements
- Held Transcendent Chest
- Updated Battlefield Supply
- Added Zombie Z Starter Package
7 January 2021[]
- Held Mileage Auction
2020[]
31 December 2020[]
- Held New Year event
- Gave away Decoders and Mileage
23 December 2020[]
- Released Italy (Xmas)
- Added Inferno difficulty to Decoy
- Held Christmas Event 2020
- Improved and held Mileage Auction
- Resold Trinity Grenade and Thunder Ghost Walker
- Thunder Ghost Walker is now available permanently from Transcendence Decoder
- Resold Miracle Prism Sword and Dual Sword Hellfire
- Dual Sword Hellfire is now available permanently from Unique Decoder
10 December 2020[]
- Unleashed Draugr
- Rebalanced Zombie 5: Rise and Zombie Z
- Added Inferno difficulty on All-Out
- Improved medal section
- Held 2020 Clearance event
- Recruited Leader Soi and Super Soldier Jennifer
- Added Xmas Floating Damage
- Updated New/Returning User prizes
- Updated Battlefield Supply
- Fixed various Scenario TX bugs
- Updated the content of Transcendence Decoder
- Added Event Decoder
26 November 2020[]
- Added Inferno difficulty to Episode Choi
- OICW, Brick Piece M777, Broad Divine and Hunter Killer X-90 can now undergo Weapon Enhancement up to +5
- Held CSO Event Ticket
- Held Doubled Season Pass Badge event
- Fixed various bugs relating Scenario TX
12 November 2020[]
- Patched Scenario TX
- Held Zombie League Season 2 Event
- Improved Medal section
- Added Inferno difficulty to Zombie Scenario
- Rebalanced Zombie Z and Zombie Rise
- Updated Battlefield Supply
- Adopted Demonic Scarlet Rose
- Added Barrett M95 White Tiger permanently to Transcendence Decoder
- Fixed various bugs
29 October 2020[]
- Recruited Boss David Black and Special Agent Criss
- Released Assault Halloween
- Added Hunter Killer X-90 Mnemonic
- Added Floating Damage Halloween
- Added CSO Event Ticket
15 October 2020[]
- Reorganized Zombie Scenario Difficulty
- Released Forest Keeper
- Gave away Dual Sword Hellfire with [Leather] paint for completing the goal
- Resold Gungnir with [Sigma] paint
- Resold Dual Beretta Gunslinger, X-TRACKER, Trinity Grenade, Barrett M95 White Tiger, Infinity Laser Fist, M3 Black Dragon and Thunder Ghost Walker in Epic Decoder
24 September 2020[]
- Held 2020 Season 7 Event
- Reorganized League Rank system
- Held Zombie League Season 1 Event
- Updated Karma system
- Rebalanced Zombie Rise
- Added new medals and missions
- Added Zombie Rise to Studio (mode)
- Improved Studio Create mode
- Adopted Build Marker
- Adopted Negev NG-7 Ajax
- Added M3 Black Dragon permanently to Transcendence Decoder
- Held Find the Zombies event
- Held Full Moon event
- Held BALROG IS BACK event
- Added Part System support to BALROGs
- Doubled the BALROGs damage during the event
- Updated Golden Zombie event
- Held Mid-Autumn Festival Mileage Auction
- Added Hunter Killer X-7
- Sold Dual Beretta Gunslinger, Trinity Grenade, Holy Sword Divine Order and Magnum Launcher for Weekend Special
- Fixed various bugs
17 September 2020[]
- Held Bonus Disassembly event
- Added Eternity Laser Fist and Miracle Prism Sword to the list
3 September 2020[]
- Adopted Miracle Prism Sword
- Held Zombie Virus Overcome event
- Held "Wait ! I'll go get a special weapon" event
20 August 2020[]
- Adopted Eternity Laser Fist
- Added Subscribe feature to Studio (mode)
- Held Zombie Rise Random Weapon event
- Added Dual Sword Phantom Slayer permanently to Transcendence Decoder
- Fixed various bugs relating Studio
6 August 2020[]
- Held Mileage Auction event
- Sold Transcendent Red Dragon Cannon Gold and Transcendent Magnum Drill Gold for Weekend Special
- Resold Pink Heart Shiho, Black Rose Miho, Cyborg and Queen
- Fixed various issues relating bots
23 July 2020[]
- Patched Zombie 5: Rise
- Released Junk House
- Updated and held Life Weapon Box event
- Held Bonus Disassembly event
- Free Magnum Launcher and Holy Sword Divine Order for 15 days for New/Returned Users
- Resold Shining Heart Rod and Starlight Rolling Shooter
- Added more weapons to Part Weapon Selection Box
- Added bot support for Gun Deathmatch
- Improved bot weaponry
9 July 2020[]
- Adopted Void Avenger and Inferno Cannon
- Held Epic Fragment event
- Resold Epic Decoder
- Added Infernal Cannon to Epic FLEX Box
- Held playtime event to obtain Epic Fragments
- Held Hero event to obtain Hero and Sidekick guns for 30 days
25 June 2020[]
- Adopted Blade Frostbreaker
- Held Mileage Bingo
- Added Studio Map Tag function
- Improved Studio Map Recommendation
- Resold Global Paint Design
- Held New Global Paint Design Idea Contest
- Fixed various bugs
11 June 2020[]
- Resold Magnum Launcher and Holy Sword Divine Order
- Resold Premium Transcendence Decoder
- Increased SCAR OZ-C and SCAR OZ-D performance
- Held Mission Supplies Event
28 May 2020[]
- Held 2020 Season 6 Event
- Reorganized Season Pass
- Added Zombie Quest feature
- Added Paint Switching feature
- Updated Golden Zombie event
- Reintroduced Weapon of the Month
- Held SKULL IS BACK event
- SKULL-1, SKULL-3, SKULL-4 and SKULL-5 are given for free as part of Weapon of the Month
- All these weapons are sold directly in the shop
- The damage for these weapons and SKULL-9 is doubled
- These weapons can now undergo Weapon Enhancement (up to +4)
- Updated Store
- Removed Erase Paint item
- Added Premium Moderator item
- Reorganized Mileage Duffel Bag
- 10,000 Mileage Duffel Bag: You can freely send amounts up to 10,000 mileage.
- 50,000 Mileage Duffel Bag: You can freely send amounts up to 50,000 mileage.
- 100,000 Mileage Duffel Bag: You can freely send amounts up to 100,000 mileage.
- 200,000 Mileage Duffel Bag: You can freely send amounts up to 200,000 mileage.
- Held 3 days Mileage Auction
- Fixed various bugs
- Updated Battlefield Supply with Season Pass Coins
11 May 2020[]
- Sold Zombie Z Weapon Box Set
- Resold Premium Class Decoder
- Held Random Weapon Zombie Hero
- Added new weapons
- Added Dust CSO Land
- Resold Private Erica and Drill Instructor Gerard
28 April 2020[]
- Adopted Psychic Harmonium
- Resold Premium Transcendence Decoder
- Patched All Star+ mode
- Added All Star and Gun Deathmatch to Studio (mode)
- Released Dust CSO Land
- Held Mileage Auction event
- Ended 2020 Season 5
- Fixed various Studio bugs
16 April 2020[]
- Resold Lucky Transcendence Weapon Box and Lucky Transcendence Class Box
- Held Zombie Hero Random Rule event
- Held Studio Kingdom Map Contest
- Fixed various Expedition bugs
2 April 2020[]
- Recruited Private Erica and Drill Instructor Gerard
- Added Old-Time Costume Box
- Resold Premium Class Decoder
- Rebalanced Behind and Envy Mask
- Added Expedition system
- Updated Store and Mileage Shop
- Updated Battlefield Supply
- Fixed various bugs including some in Zombie Scenario maps, Studio New Zombie Shelter and on some weapons
19 March 2020[]
- Added Harvested Fruit
- Released Italy (Joseon) and Researcher's Journal Abduction #Joseon
- Added Studio Joseon Pack
- Held Studio Kingdom Contest
- Held Seed event
- Resold Thunder Ghost Walker and Dual Sword Phantom Slayer
- Rebalanced Lightning Fury
5 March 2020[]
- Adopted Lightning Fury
- Added Enhanced Weapon Box
- Held Candy event
- Resold Transcendence Decoder
- Released Joseon Village
- Replaced Green Dragon Blade with Starlight Rolling Shooter in Unique Decoder
- Updated shop and Mileage Shop
- Held Studio Kingdom Map Contest event
- Held Bonus Disassembly event
- Updated Battlefield Supply
- Fixed various bugs relating Studio Zombie Shelter
20 February 2020[]
- Adopted Starlight Rolling Shooter
- Sold Unique Decoder in shop
- Held Random Rule Zombie Hero event
- Held Arithmetic event to get Jiang Shi
6 February 2020[]
- Held 2020 Season 5 Event
- Updated Zombie Z
- Adjusted Daily Missions
- Held Valentine event
- Updated Battlefield Supply
- Fixed an issue where Magnum Launcher's B mode explosion sound was overlaid
21 January 2020[]
- Re-added SVD Custom, Quad-barreled shotgun, Dual Kriss Custom and M134 Vulcan
- Re-added Dual Desert Eagle, Dual Nata Knives, Dual MP7A1, Poison Gun and AK-47 60R
- Patched Studio Zombie Shelter
- Removed Top Class Decoder from store
- Held Stingray Kite and Mileage Auction events
- Added Barrett M95 White Tiger and Hunter Killer X-45
- Resold Axion, Aetheris, Kal-El and Medea
- Fixed Venom Guard model changing to Chaser Zombie in Studio Script mode
9 January 2020[]
- Adopted Heaven Splitter and Scorching Auto-Shotgun
- Resold Epic Decoder
- Held Epic Fragment event
- Held Golden Zombie event