zenless zone zero
There are 20 tutorials that focus on the hollow explorations:
Differences in Hollow Activity
Tutorial Differences in Hollow Activity 1
The pressure bar of the HDD indicates the current pressure level Agents are experiencing in the Hollow. Ether activity varies across different Hollows, and Agents operating in Hollows with a higher level of Ether activity will encounter more intense pressure.

Tutorial Differences in Hollow Activity 2
Hollow activity level is low, and Pressure will not increase.
The designated area for the commission is currently experiencing a low level of activity within the Hollow. The Corruption of Etheric Matter is low and will not increase Pressure.

Tutorial Differences in Hollow Activity 3
Hollow activity level is moderate, and Pressure will increase in certain areas.
The designated area for the commission is currently experiencing a moderate level of activity within the Hollow. The Corruption of Etheric Matter is manageable, but there will be a moderate increase in Pressure.

Tutorial Differences in Hollow Activity 4
Hollow activity level is high, and Pressure will increase in all areas.
The designated area for the commission is currently experiencing a high level of activity within the Hollow. The Corruption of Etheric Matter is severe, and there will be a tremendous increase in Pressure.
Hollow Zero
Tutorial Hollow Zero 1
Hollow Zero, also known as "Limbo," is a colossal Hollow that consumed the old Eridu, resulting in its destruction, and serves as the source of several massive Hollows in and around New Eridu.
The investigation and neutralization of Hollow Zero pose a long-term challenge for the authorities of New Eridu, both presently and in the future.

Tutorial Hollow Zero 2
The Hollow Investigative Association will regularly issue commissions to investigate Hollow Zero and give rewards to those who complete the commissions.

Tutorial Hollow Zero 1
Once you've explored the Core area, you can choose to continue your exploration into Withering Garden and challenge more powerful enemies for more lucrative rewards.
Basic Movement
Tutorial Basic Movement 1
  • PC
  • Mobile
  • Controller

Use W S A D or click on the monitors to move around.
Hold Mouse Left-Click to drag and adjust the camera. Scroll Mouse Scroll-Wheel to zoom in and out.
Upon selecting a distant location, the HDD system will automatically find an accessible path and guide Eous to move there.

Tap the monitors to move around. Drag the screen to adjust the camera. Pinch with two fingers to zoom in and out.
Upon selecting a distant location, the HDD system will automatically find an accessible path and guide Eous to move there.

Drag Controller L or press Controller DPAD Up Controller DPAD Down Controller DPAD Left Controller DPAD Right to move around.
Drag Controller R to adjust the camera. Use Controller LT and Controller RT to zoom in and out.

Observation Data
Tutorial Observation Data 1
Scattered throughout the Hollows, you'll find crucial materials known as "Observation Data."
Each commissioned Hollow contains 3 sets of Observation Data.
Collecting these data sets increases the final rating of your commission and rewards you with additional Polychromes.

Observation data in the Hollow will be saved once picked up.
You don't need to pick it up again when exploring the same area.
Supply Box
Tutorial Supply Box 1
  • PC
  • Mobile
  • Controller

Open the supply box to obtain Agent upgrade materials.
You can check your collected materials in the Inventory in the bottom-right corner or by pressingB.

Open the supply box to obtain Agent upgrade materials.
You can check your collected materials in the Inventory in the bottom-right corner.

Open the supply box to obtain Agent upgrade materials.
You can check your collected materials by pressing Controller RB to open your Inventory.

Pressure & Corruption
Tutorial Pressure & Corruption 1
Certain Hollows contain zones of high Ether activity.
In these zones, stepping into an unexplored territory will increase Pressure.

Tutorial Pressure & Corruption 2
Once your squad's Pressure reaches 100, your Agents will suffer Pressure Overload, obtain a random Corruption, and have their Pressure reset to 0.
Corruptions have an impact on your combat and exploration abilities. Click on the Corruption bar in the bottom-left or press <Action:UIHollowCurse> to see more details.
Bangboo Plug-Ins
Tutorial Bangboo Plug-Ins 1
  • PC
  • Mobile
  • Controller

While exploring Hollows, you may come across Bangboo Plug-Ins with various effects.
Click on the Bangboo Plug-In on the left or tap R to check your Bangboo Plug-Ins. Press and hold the Bangboo Plug-In on the left or R to quick use it.

While exploring Hollows, you may come across Bangboo Plug-Ins with various effects.
Tap the Bangboo Plug-In on the left to check your Bangboo Plug-Ins. Tap and hold the Bangboo Plug-In on the left to quick use it.

While exploring Hollows, you may come across Bangboo Plug-Ins with various effects.
Tap Controller X to check your Bangboo Plug-Ins. Press and hold Controller X to quick use it.


Tutorial Bangboo Plug-Ins 2
Bangboo Plug-Ins are divided into Stable Plug-ins and Consumable Plug-Ins based on their usage limits.
Once acquired, Stable Plug-Ins can be used an unlimited number of times, while Consumable Plug-Ins lose their charges after each use.
Resonium
Tutorial Resonium (Hollow Exploration) 1
  • PC
  • Mobile
  • Controller

In certain Hollows, you may find mild Ether matter polymers known as Resonia, which provide combat and exploration buffs for your squad.
Click on the Resonium inventory on the left or press C to check your collected Resonia.

In certain Hollows, you may find mild Ether matter polymers known as Resonia, which provide combat and exploration buffs for your squad.
Tap the Resonium inventory on the left to check your collected Resonia.

In certain Hollows, you may find mild Ether matter polymers known as Resonia, which provide combat and exploration buffs for your squad.
Press Controller Y to open your Resonium inventory and check your collected Resonia.


Tutorial Resonium (Hollow Exploration) 2
Collecting 4 or 8 Resonia of the same type triggers a Resonance reaction, granting 1 additional Advanced Resonium of the same type.
Advanced Resonia grant improved buff effects, but do not factor into Resonance reactions.
Bangboo Squad
Tutorial Bangboo Squad 1
While exploring Hollow Zero, you might encounter Ally Bangboo willing to join your squad and help you in battles.
Ally Bangboo can unleash Active Skills, but they are not able to use Bangboo Chain Attacks.

You can have up to 2 Ally Bangboo in your squad.
If you accept a new Ally Bangboo when you already have 2, one of them needs to quit the squad.
Bangboo Merchants
Tutorial Bangboo Merchants 1
You may encounter Bangboo merchants in the Hollows who sell Resonium Catalysts.
Catalyzed Resonia can grant more powerful buffs to your squad members.
Accelerated Playback Mode
Tutorial Accelerated Playback Mode 1
  • PC
  • Mobile
  • Controller

You can accelerate the display of text, voice, and animations on the monitor in the HDD system by using the Accelerated Playback Mode.
Press Mouse Left-Click /Press L Shift to enter the Accelerated Playback Mode.

You can accelerate the display of text, voice, and animations on the monitor in the HDD system by using the Accelerated Playback Mode.
Press and hold on the screen to enter Accelerated Playback Mode.

You can accelerate the display of text, voice, and animations on the monitor in the HDD system by using the Accelerated Playback Mode.
Press Controller A to enter the Accelerated Playback Mode.


Tutorial Accelerated Playback Mode 2
  • PC
  • Mobile
  • Controller

You can also press the upper left speed-up switch / press T to turn on/off the speed-up mode.

You can also press the upper left speed-up switch to turn on/off the speed-up mode.

You can also press Controller LS to turn on/off the speed-up mode.

Terminal located
Tutorial Terminal Located 1
Don't worry!
Despite failing the challenge, enough location data has been collected. When undertaking the commission again, you can directly challenge the end. This is the final battle of the commission, so make sure you're ready.
Before retrying the challenge, you can strengthen your Agents and adjust your squad members.

Applicable only to the final battle (excluding some challenge commissions)
Jackhammer and Rock Obstacles
Tutorial Jackhammer and Rock Obstacles 1
After acquiring the Jackhammer, Move towards/press and hold on the rock continuously to destroy it.

Rock obstacles come in different hardness levels, and you'll need to upgrade the Jackhammer's drill level to break through harder rocks.
Shiyu Defense
Tutorial Shiyu Defense 1
There are 2 defense areas in Shiyu Defense:
  • Stable Nodes: Open permanently
  • Critical Nodes: Periodically update the stages and rewards
Defeat all enemies within the limited time to complete the challenge.
Rewards will vary based on the time taken to complete the challenge.
Hollow Zero Squad Configuration
Tutorial Hollow Zero Squad Configuration 1
In an investigation of Hollow Zero, one Agent will be assigned as the leader of a squad consisting of multiple additional squad members.
The leader will first head into the Hollow alone. It is recommended to assign a powerful Agent as the leader.

Tutorial Hollow Zero Squad Configuration 2
Other squad members will be able to join the exploration at random in the special event Call for Support!
Hollow Zero Rewards
Tutorial Hollow Zero Rewards 1
Take part in the Hollow Zero operation to earn Investigation Points. Accumulate more Investigation Points to increase your License Level and obtain rich item rewards.
The limit for earning Investigation Points and Bounty Commissions will be reset at a fixed time each week.

Tutorial Hollow Zero Rewards 2
Use the Compendium
to quickly enter or check your progress in Hollow Zero.
Outpost Logistics
Tutorial Outpost Logistics 1
By completing special assignments in Hollows or exploring Hollow Zero, you earn Z-Merits, which can be exchanged for valuable items at Outpost Logistics. Items in Outpost Logistics are cleared and restocked at the beginning of each month, so be sure to exchange for any items in time.
Association Supplies
Tutorial Association Supplies 1
Participate in Deadly Assault, Shiyu Defense, Notorious Hunt, and other challenges to obtain Investigation Merits, which are used to purchase valuable items in Association Supplies.
Association Supplies are refreshed on the 1st of every month. Please remember to purchase items on time.
Inferno Reap
Tutorial Inferno Reap 1
180s Time Trial Challenge; Deal as much DMG as possible to Nineveh before the countdown ends.

Tutorial Inferno Reap 2
You can equip aResonium Kit for your challenge. Complete Withering Garden challenges to obtain Resonium Kits.

Tutorial Inferno Reap 3
When the countdown reaches 120s, Nineveh enters Overload Activation, which increases the DMG that Nineveh deals and takes in combat.
When the countdown reaches 60/30s, Overload Activation will be further enhanced.

Tutorial Inferno Reap 4
Defeat the Constricting Vines and Hornets in the stage to extend the challenge duration.
Simulated Battle Trial
Tutorial Simulated Battle Trial 1
Proxies can use their own Agents and Bangboo and challenge the Simulated Battle Trial Tower floor by floor, defeating powerful enemies to obtain Polychromes, Hamster Cage Passes, Tuning Calibrators, Hi-Fi Master Copies and other rare rewards!

Tutorial Simulated Battle Trial 2
The Simulated Battle Trial Tower is split into multiple phases:
Floors 1 to 5: Training
Floors 6 to 10: Skirmish
Floors 11 to 15: Clash
Floors 16 to 20: War
Floors 21 to 25: Carnage
Above floor 25: Endless Conflict
In the challenges of a single phase, Agent HP will be retained across floors and will not recover. HP will only be fully recovered upon successfully clearing a full phase.

Tutorial Simulated Battle Trial 3
Normal enemies, elite enemies, mini-bosses, and powerful bosses may all gain a buff known as Demonized. Sometimes, you can cleanse Demonized by using appropriate strategies. Hone your skills to get to the top!

Tutorial Simulated Battle Trial 4
By reaching certain floors in the Simulated Battle Trial, you can obtain different ranks of badges of honor depending on your achievements.
Start off with the Initial Battle Bronze Badge.
Complete floor 5 to obtain Entrapment Silver Badge.
Complete floor 10 to obtain Onslaught Gold Badge.
Complete floor 15 to obtain Dominance Diamond Badge.
Complete floor 20 to obtain Battle Master Badge.
Complete floor 25 to obtain Undefeated Legend Badge.
Display these badges in your profile to show off to your friends!

Tutorial Simulated Battle Trial 5
After completing floor 25, Endless Conflict will be unlocked in the Simulated Battle Trial. In Endless Conflict, you can keep challenging increasingly powerful enemies, there will be no more phases, and your Agent HP will not recover in any way outside of combat. The highest floor you manage to reach will be recorded and displayed on the main interface and badge.