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Zenless Zone Zero (ZZZ)
The Mystery of Arpeggio Fault Event Guide
☆ New: Tier List Maker & Community Tier List Contest!
★ Upcoming: Version 2.5, Zhao, & Ye Shunguang!
☆ 2.4 Agents: Dialyn, & Banyue
★ 2.3 Phase 2: Yidhari Release & Ju Fufu Rerun
☆ Tier Lists: Agents | W-Engines | Bangboos | Teams
★ Redeem Codes for free Polychromes!
Zenless Zone Zero's The Mystery of Arpeggio Fault Event is an HDD Exploration Event inside the Hollow Zero. See how to play the Arpeggio Event in ZZZ, how to unlock it, stages and all the rewards in this Zenless Zone Zero (ZZZ) guide!
| The Mystery of Arpeggio Fault Event | |||||
|---|---|---|---|---|---|
 Fault Surface |
 Old Observatory |
 Outpost Beacon |
|||
 Laboratory Ruins |
 Turbulent Corridor |
 Bangboo Password |
|||
| Slumbering Land Quest | Where the Mystery Went Quest | ||||
List of Contents
The Mystery of Arpeggio Fault Event Information
The Mystery of Arpeggio Fault Event Details
|
|
| Event Start | November 6, 2024 |
|---|---|
| Event End | December 17, 2024 |
| Unlock Conditions | Clear “Qualification Assessment: Edge” in Hollow Zero |
| Rewards |
|
The Mystery of Arpeggio Fault is a roguelike gameplay mode in Hollow Zero, where Proxies can go through 5 stages of HDD Exploration Commissions in exchange for rewards and Knightboo!
How to Unlock The Mystery of Arpeggio Fault
Mystery of Arpeggio Fault Requirements
In order to unlock the Mystery of Arpeggio Fault event, Proxies must first clear the Qualification Assessment: Edge stage of Hollow Zero. After completing the requirements, Proxies can take on the challenge at Scott Outpost.
Qualification Assessment Guide
The Mystery of Arpeggio Fault Stages
All Areas in The Mystery of Arpeggio Fault
| Stages | Unlock |
|---|---|
| Stage 1: Fault Surface |
Progress through the commission The Mystery of Arpeggio Fault - Special Investigation. |
| Stage 2: Old Observatory |
Complete commission The Mystery of Arpeggio Fault - Special Investigation. |
| Finish exploring Fault Surface - Fault Floor | |
| Stage 3: Outpost Beacon |
Complete commission The Mystery of Arpeggio Fault - Unravelling. |
| Finish exploring Old Observatory - Fault Floor | |
| Stage 4: Laboratory Ruins |
Complete commission The Mystery of Arpeggio Fault - Final Puzzle Piece. |
| Finish exploring Outpost Beacon - Fault Floor | |
| Stage 5: Turbulent Corridor |
Finish exploring Laboratory Ruins - Fault Floor |
The Mystery of Arpeggio Fault is divided into 5 parts, each can be unlocked after completing certain commissions and different event stages prior.
How to Play The Mystery of Arpeggio Fault
The Mystery of Arpeggio Fault Guide
- Explore Through the HDD
- Bump Into Enemies to Defeat Them
- Upgrade The Tech Tree
- Select a Data File Before Exploring
Explore Through the HDD
Explore through 5 chapters of a brand new HDD in Hollow Zero. Deep dive into the different areas to look for items and complete your objectives.
Bump Into Enemies to Defeat Them
| Bump Into Enemies to Defeat Them | |
|---|---|
 Compare ATK and HP |
 Enemy Defeated |
Bump into enemies to defeat them in exhcange for rewards and EXP. It is recommended to increase your ATK so you do not receive damage when the enemy's HP is less than or equal to your ATK.
Thus, always keep an eye on your HP and ATK before bumping into an enemy!
Upgrade The Tech Tree
Use the Crimson Silk obtained from HDD exploration to upgrade the Tech Tree to enhance your skills, damage, and many more to make your experience more fun in the HDD.
As you progress through the event, you'll receive more Tech Tree nodes and Crimson Silk to customize your loadout and power up even more!
Select a Data File Before Exploring
Select a Data File before exploring to augment your play style inside the HDD. These Data Files provide various buffs, items, and more as you level up.
Like Tech Tree Nodes, you unlock Data Files one after another as you progress through each area.
The Mystery of Arpeggio Fault Agents
All Mystery of Arpeggio Fault Companions
| Agent | Stats and Effects |
|---|---|
 |
ATK: 8, HP:25 Cost: 0 Anby has a 20% Crit Rate, dealing double DMG upon a critical hit. |
 |
ATK: 10 HP: 28 Cost: 50 Anton will keep attacking even after his HP drops to 0, each attack thereafter will cause him to lose 1 ATK. |
 |
ATK: 2 HP: 80 Cost: 25 When Koleda is on-field, Ben has a 50% chance to generate an explosive bomb when attacking. |
 |
ATK: 30 HP: 10 Cost: 40 After the Protagonist takes DMG for the first time, Billy's ATK -15. Billy's attack range is 3. |
 |
ATK: 3 HP: 35 Cost: 30 Caesar has a 50% chance to reflect DMG when hit (taking no DMG and returning the DMG to the enemy). |
 |
ATK: 20 HP: 10 Cost: 20 When Corin gains ATK, she'll gain +1 additional ATK. |
 |
ATK: 10 HP: 12 Cost: 25 When Ben is on-field, Koleda's attacks are guaranteed to be critical hits. |
 Lighter |
ATK: 5 HP: 40 Cost: 50 Lighter's ATK +20 while the Protagonist has less than 20 HP. |
 |
ATK: 12 HP: 15 Cost: 10 Nekomata generates 100 Gear Coins when attacking. |
 |
ATK: 0 HP: 24 Cost: 20 Nicole's ATK equals 1/100 of the Coin count. |
 |
ATK: 30 HP: 60 Cost: 60 Soldier 11's ATK will not increase. |
 |
ATK: 5 HP: 22 Cost: 70 Enemies hit by Tsukishiro Yanagi will create a box, making it so only Yanagi can attack that enemy, and providing EXP equivalent of defeating that enemy everytime she attacks it. |
Agents can accompany you as you explore the event's stages. You can unlock agents and increase the amount of agent companions through Contribution Points, which you receive by defeating enemies!
The Mystery of Arpeggio Fault Event Rewards
Get the Exclusive Bangboo: Knightboo
| Requirements | Rewards |
|---|---|
| Complete the exploration of fault Area 1 |  Knightboo
x1 |
| Complete the exploration of fault Areas 2 - 5 |  Knightboo Core x4 |
Completing the exploration of fault Area 1 will reward you with the event exclusive Bangboo, Knightboo!
You can also get its copies, the Knightboo Core, by exploring fault Areas 2 - 5. As of now, these are the only way to get copies of Knightboo.
All Mystery of Arpeggio Fault Rewards
| All Event Rewards | ||
|---|---|---|
|
Polychrome
|
Specialized Shock Chip
|
Senior Investigator Log
|
|
Bangboo System Widget
|
Official Investigator Log
|
 W-Engine Power Supply
|
 Inter-Knot Credit
|
 Denny
|
|
Total Rewards For Every Category
| Category | Rewards |
|---|---|
| Fault Surface |
Polychrome
x110 Denny
x30,000 |
| Old Observatory |
Polychrome
x110 Denny
x30,000 |
| Outpost Beacon |
Polychrome
x110 Denny
x30,000 |
| Laboratory Ruins |
Polychrome
x110 Denny
x30,000 |
| Turbulent Corridor |
Polychrome
x110 Denny
x30,000 |
Battle Pass Rewards
| Requirements | Rewards |
|---|---|
| Clear all stages in the Fault Surface region in "The Mystery of Arpeggio Fault" |  x1600 |
| Clear all stages in the Outpost Beacon region in "The Mystery of Arpeggio Fault" | x1600 |
Clearing all the stages in the Fault Surface and Outpost Beacon reagions in "The Mystery of Arpeggio Fault will reward you with a total of 3200 New Eridu City Fund EXP.
Note that you can claim this reward on the New Eridu City Fund menu and not on the event's menu.
New Eridu City Fund Battle Pass Guide
Zenless Zone Zero Related Guides
Ongoing Events
| Event Guide | Event Duration | |
|---|---|---|
 Lightstream Notes
|
12/03/2025 - 12/29/2025 | |
 Neo Golden Mecha
|
11/28/2025 - 12/29/2025 | |
 All-New Program
|
11/26/2025 - 12/29/2025 | |
 En-Nah Chess Saga
|
11/26/2025 - 12/29/2025 | |
 The Final Callback
|
11/26/2025 - 12/17/2025 | |
 Signal Search Thank-You Gift
|
10/15/2025 - 01/07/2026 | |
Upcoming Events
| Event Guide | Event Duration | |
|---|---|---|
 Data Bounty - Combat Simulation
|
12/24/2025 - 12/29/2025 | |
 En-Nah Into Your Lap
|
12/17/2025 - 12/29/2025 | |
 100% Miss Bunny
|
12/17/2025 - 12/29/2025 | |
 Advanced Bounty - Area Patrol
|
12/11/2025 - 12/16/2025 | |
 Simulated Sequence Showdown
|
12/08/2025 - 12/29/2025 | |
Permanent Events
| Event Guide | How To Unlock/Rewards |
|---|---|
 Road to Proxy Greatness |
Reach Inter-Knot Level 8. |
 Rookie on the Road |
Reach Inter-Knot Level 8. |
Past Events
| Event Guide | Event Duration | |
|---|---|---|
 141 Battery Artwork
|
07/05/2025 - 07/15/2025 | |
 141 Eco Art Exhibition
|
11/12/2025 - 11/24/2025 | |
 141 Exclusive Bazaar
|
08/02/2024 - 08/12/2024 | |
 141 Friendship Fair
|
10/27/2024 - 11/04/2024 | |
 141 Going Green for Everyone
|
02/26/2025 - 03/10/2025 | |
 A Dream Come True at Last
|
01/24/2025 - 02/05/2025 | |
 A Tale Through the Looking Glass
|
05/19/2025 - 06/05/2025 | |
 Band of Brave Bangboo
|
09/05/2025 - 10/13/2025 | |
 Bangboo Bash
|
04/27/2025 - 05/12/2025 | |
 Bangboo vs Ethereal
|
12/20/2024 - 01/20/2025 | |
All Web Events
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The Mystery of Arpeggio Fault Event Guide
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