CSO |
- See updates from 2016-2019: Events (South Korea)/2016-2019
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
- Released Zombie League Season 2
- 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 system
- 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
Community content is available under CC-BY-SA unless otherwise noted.