Latest updates and maintenance schedule for October 2025 in Chaos Zero Nightmare (CZN). See patch notes details, release dates, server maintenance notice, and event announcements.
Table of Contents
Update Information
There is currently no new update information.
Maintenance Information
October 24 Temporary Maintenance NEW
| Data Update Time | October 24 2:00 AM – 7:00 AM (Extended by 1 hour) *The maintenance is now over |
Maintenance Extension Compensation
- 160 Crystals (Distributed via mailbox, Storage Period: 7 days)
- Claim Period: From the end of maintenance on October 24 until October 25 23:59
Details of the Data Update
- Payment error issue response for missing items follow-up measures.
- Fixed an issue where Mental Breakdown animation does not appear in certain battle situations.
- Fixed an issue where monster animations may occasionally not display correctly when using Veronica’s EP skill.
- Fixed an issue where the timer in “Policy Office: Policy Recruitment in progress” does not display correctly.
- Fixed an issue where when using Haru’s multiple Anchor Shots, usage count within the card does not display.
- Fixed an issue where the amount of Aether does not appear correctly in the Chaos Loot popup after clearing Chaos Manifestation.
- Fixed an issue where the N badge from the Trauma Code banner remains visible even after checking the content.
- Fixed an issue where in Unidentified Area, an error message may appear when acquiring equipment already owned.
- Deleting penalty where the player loses Save Data when escaping Nightmare Mode
October 23 Data Update
| Data Update Time | October 23 2:40 AM – 3:30 AM *Maintenance has ended |
Data Update Details
- Fixed a bug where the game would not progress when reconnecting to the corresponding chapter after clearing the Tutorial → [Eye of the Storm].
- PC Client: Fixed a bug that caused the game to freeze when quickly and repeatedly selecting "Claim All" for Achievement rewards.
- Fixed some display issues.
- Changed some of the blocked word settings.
- Fixed a bug where Partner images were not displaying correctly on some devices.
- Added an example to the informational text within the Rescue rates to better explain the Rescue system.
- Fixed a bug where Haru's Anchor Shot would not be used under certain conditions during auto-battle.
- Save Data Decoration: Fixed an issue where "Favorite Customization" settings appeared to have been reset.
- Fixed an issue where the game would not progress if an enemy was defeated with an Extra Attack to end the battle in a Battle Mission.
- Fixed an issue where the game could not progress after a battle failure when using a trial unit formation.
- Alkianon Supply: Fixed an issue where the number of owned Crystals was not immediately reflected on the settings screen after purchasing Zero Data.
Chaos Zero Nightmare Related Guides
Early Game Guide
Daily Tasks
Recommended Gacha Banner
Ark City Guide
Card Epiphany Activation
How to Use Ego Skill
Stress Management
Weakness Attribute Guide
Safe Zone Guide
How to Restore Aether
How to Raise Captain Grade
ID Card Settings
Battle Pass (Arkhianon Supply) Guide & Should You Buy?
Simulation Guide
Twin Star's Shadow Guide
How to Download & Sync Data
Deep Trauma Guide
Chapter 2-5 Guide 
Character Enhancement Guide
How to Set and Upgrade Partner
How to Upgrade Potential
How to Use Save Data
How to Upgrade Manifest Ego
Memory Fragments 
