CSO

See updates from 2016-2019: Events (South Korea)/2016-2019

5 May 2021

Held 2021 Season 9

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