Zenless Zone Zero List Of Key Items Guide - Theria Games

Introduction to Zenless Zone Zero List of Key Items Guide

In Zenless Zone Zero, Key Items are a unique and essential class of resources that play a vital role in a player’s progression throughout the game. Unlike common consumables or currency—such as Battery Charge, Dennies, or Polychromes—Key Items are typically not spent, traded, or used up. Instead, they are kept in your inventory as persistent assets that often serve as crucial components for unlocking story events, accessing new game features, progressing through character-specific quests, or opening up previously unavailable locations. Many Key Items act as tokens of progression, proof of achievement, or tools required to interact with specific game systems or NPCs.

These items are often obtained through unique or time-sensitive means, such as advancing in the main story, completing Agent Story missions, participating in limited-time events, reaching certain milestones, or fulfilling hidden objectives. Because they are usually tied to specific systems or narratives, missing out on them—or not knowing their function—can lead to confusion or stalled progression. For example, certain Key Items might be required to unlock deeper levels of an agent’s backstory, gain access to new Hollow areas, or interact with special terminals or vendors in New Eridu.

Furthermore, Key Items may be stored in a separate inventory tab, distinct from typical materials or gear, reinforcing their importance and non-consumable nature. They often do not have an immediate, active use (such as “use item” functionality), but rather function passively to unlock options or enable game triggers when specific conditions are met.

This guide aims to provide a comprehensive and up-to-date overview of all Key Items available in Zenless Zone Zero, detailing how each one is obtained and what its purpose is within the game. Whether you’re a new player trying to understand what these items are for, or a seasoned Proxy looking to complete your collection, this guide will serve as a reliable reference to ensure you’re never left wondering how or why a Key Item matters.

Categories of Key Items

In Zenless Zone Zero, Key Items can be grouped into different categories based on their function and how they are acquired. These items are crucial for long-term progression and are not used up or consumed in the same way as regular resources, such as food or materials. Instead, they serve distinct purposes that can impact various gameplay systems. Some Key Items may unlock new areas, enhance your Agents or equipment, or even grant access to exclusive content and rewards. Others might be needed to complete specific quests or challenges. Understanding these categories is key to managing your inventory efficiently and making the most of your resources.

By identifying which Key Items are required for different stages of the game or for advancing particular aspects of your progress, players can plan ahead and focus on the right items at the right time, ensuring they don’t miss out on crucial opportunities. Each Key Item serves a vital role, whether it’s supporting exploration, strengthening Agent relationships, or facilitating major upgrades, and knowing their function helps you prioritize what to collect and use.

One major category includes Currency Items. These are special types of currency that are not part of the regular economy like Dennies or Polychromes but are instead tied to specific functions, shops, or exchange systems. These items often unlock unique rewards or allow for the acquisition of rare agents, materials, or cosmetics. They cannot usually be farmed through standard gameplay and are often linked to events, missions, or milestone completions.

Another category includes Commission Items, which are typically obtained through completing specific commissions or quests. These items may serve as proof of completion or as tickets to unlock future missions or content. In some cases, they are required to progress through multi-part quest chains or to unlock special Agent Story paths. Their presence in the inventory often signals a player’s progression through key parts of the game’s narrative or side content.

Another important group of Key Items includes Hollow Exploration Items, which are found or used exclusively within Hollows—dimensionally unstable zones central to the game’s setting and progression. Some of these items are tied to unique mechanics within Hollow missions, such as unlocking sealed routes, accessing rare encounters, or interacting with special anomalies. Their use is often localized to exploration but critical for uncovering hidden rewards or completing objectives tied to exploration milestones.

Finally, there are Photowall Items, which serve as collectible live wallpapers featuring various agents. These are cosmetic Key Items that reflect a player’s relationship progression with individual agents. To obtain a Photowall Item, such as Agent Wallpaper – Ben, players must raise an agent’s Trust Level to a specific threshold, typically Trust Level 4. Trust can be earned by completing Agent Story content and participating in trust-building activities. Once an agent’s trust meter is filled, the wallpaper is automatically unlocked and can be applied to personalize parts of the player’s in-game interface. These wallpapers provide both aesthetic value and a sense of accomplishment, as they visually represent the player’s dedication and bond with their chosen agents.

Together, these categories form the foundation of Key Item classification in Zenless Zone Zero, each serving a distinct but essential role in advancing through the game’s systems, stories, and challenges. Players who understand these classifications will have a clearer sense of which items to keep an eye on, which ones mark progress, and how best to leverage them for long-term success in New Eridu.

Detailed List of Key Items, How to Obtain Them, and Their Uses

Currency Items

Currency items in Zenless Zone Zero are essential for a wide range of gameplay functions, from acquiring new agents and Bangboos to enhancing equipment and accessing limited-time content. These currencies are obtained through gameplay, events, or gacha pulls and are typically not consumed as quickly or frequently as basic resources, giving them a more “key” status in the overall progression system.

Denny is the primary in-game currency earned by operating the Random Play video store and completing various activities. It is mainly used to purchase consumables, level-up materials, and gear from shops like the Bangboo Store, making it a core currency for progression and daily management.

Monochrome Film is a special currency that can be exchanged for Polychrome. It plays a role in events or milestone rewards where conversion into Polychrome helps extend the player’s pull resources.

Polychrome is one of the most valuable currencies in the game. It can be used to acquire Master Tapes and Encrypted Master Tapes, which are used in the Signal Search (gacha system) to summon agents and W-Engines. Additionally, Polychrome can replenish Battery Charge, buy levels in the New Eridu City Fund, or access premium content. It is earned from nearly all forms of gameplay including missions, events, and achievements.

Master Tapes are the standard gacha currency used in Signal Search to summon agents or W-Engines from the permanent banner. Encrypted Master Tapes, on the other hand, are used for limited-time Signal Searches that feature exclusive or time-limited agents and W-Engines. Encrypted Master Tapes are more valuable and should be prioritized when available in the Signal Shop or event rewards.

Boopon is a specialized currency used exclusively to summon Bangboo units in the Signal Search. Boopons are obtained from completing missions, participating in events, and progressing through the Hollow Deep Dive Zone. They cannot be bought with real-world currency, adding to their exclusivity and value.

Bangbuck is earned through Bangboo-related activities, particularly from summoning Bangboos. It is used in the Signal Shop to purchase additional Boopons or materials specifically for Bangboo development.

Fading Signal is a residual currency gained from conducting Signal Searches. It can be used in the Signal Shop to purchase discounted Master Tapes and Encrypted Master Tapes, along with other items. It is a valuable source of long-term gacha pulls as it accumulates naturally through regular gacha activity.

Residual Signal is obtained by pulling duplicate S- and A-rank agents and W-Engines, or when maxed-out characters are pulled again. It can be used in a dedicated shop to purchase Encrypted Master Tapes and other rare resources, giving long-term players more control over acquiring premium items.

W-Engine Chips are used for crafting W-Engines and are obtained by recycling duplicate A-rank W-Engines or completing certain side quests. They serve as a crafting material that supports weapon and gear enhancement systems.

Battery Charge functions as the stamina system in Zenless Zone Zero. It regenerates over time (1 every 6 minutes, up to a cap of 240) and is required to participate in many gameplay activities, including combat encounters and exploration missions. Players can replenish Battery Charge with Polychrome or by visiting the Coffee Shop once per day.

Ether Battery is a Key Item that restores 60 Battery Charge. It is typically obtained through missions or special events and provides a strategic option for managing stamina during intensive gameplay sessions.

Inter-Knot Credit appears to be linked with player progression or in-game systems that relate to Inter-Knot features. It may support account-wide unlocks or long-term player profile enhancements.

Assessment-Only Student ID is a specialized item likely tied to certain progression phases, such as assessments or trials within the story or tutorial content.

Z-Merits function as a form of in-game currency likely tied to achievements or challenge-based systems. They may be redeemed for unique rewards.

Commission Items

Commission items are a diverse category of Key Items obtained by completing quests, commissions, agent stories, and world exploration activities. These items often act as tokens of completion or progression and are sometimes prerequisites for unlocking new content, accessing exclusive areas, or triggering special events.

Examples include Apex Predator, Bangboo Give Me Strength, Dew-Covered Card, and Frosty Eviction, each tied to specific in-game storylines or agent progression tasks. Others like Full Firepower, Fully Charged, Hammer Sparks, and Hostile Wake-Over represent themed objectives tied to particular agents or regions.

There are also commemorative items such as the HIA Commemorative Coin, with variants like Blazewood and Radiance, which may serve as collectibles or be used in specific trade or unlock scenarios. Items like Lost W-Engine, Construction Machinery Parts, and Investigation Point may unlock further narrative branches, deepen agent lore, or enable certain NPC interactions.

Several items are related to Mewmew’s Exploration Notes, such as Construction Site Notes and Sixth Street Notes, often rewarded for completing exploration challenges or specific location-based tasks. These items contribute to event progress or unlock extra content.

Other notable items include My BGM is On, Solid Companionship, Doggy Voucher, Snaky Voucher, and HIA Commemorative Marble, each potentially linked to events, cosmetic unlocks, or relationship-building systems. These commission-related Key Items encourage deeper engagement with world-building and side content, rewarding players for thorough exploration and narrative investment.

Hollow Exploration Items

Hollow Exploration Items are used within Hollow Zero, a specialized game mode where players explore procedurally generated zones filled with combat challenges, secrets, and progression-based puzzles. While not always explicitly labeled as Key Items, many of these resources play a critical role in Hollow-based content and are essential for maximizing rewards or advancing systems within this mode.

Bangboo Chips, available in S, A, B, and C ranks, are used to upgrade Eous, the support Bangboo companion in Hollow explorations. Through Chip Splicing, players can unlock additional features and boost combat efficiency within the Hollow.

Ether Fluid is a currency used to obtain Bangboo Chips at the Remodeling Shop and is crucial for Bangboo System Optimization, particularly when upgrading Combat Bangboos past certain thresholds.

Resonium is another specialized resource tied to Hollow Zero. It is often found during explorations and may be linked to completing Ray’s Research Log, a progression mechanic within the Hollow that rewards exploration, data collection, and combat mastery.

Photowall Items (Live Wallpapers)

Photowall Items are cosmetic Key Items that allow players to personalize their in-game interface by setting live wallpapers themed after their favorite agents. These items are typically tied to Trust Levels, which players can build by spending time with agents, completing their stories, and interacting with them through the Partner Archive.

For example, unlocking Agent Wallpaper – Ben requires players to raise Ben’s Trust Level to Level 4. Trust Levels are a hidden progression system tied to your interactions and battle experience with each Agent. Once an Agent’s Trust reaches a high enough threshold, unique rewards—like live wallpapers or story events—become available. These levels can be viewed and tracked via the Partner Archive, where each Agent’s Trust meter indicates how close you are to unlocking their special content.

To earn Trust, players typically need to include the Agent in combat, complete their side missions, or reach certain milestones in the main story. When the Trust meter is filled completely, the associated rewards such as Photowall Items are unlocked automatically, offering both a sense of achievement and a visual representation of your bond with the character.

Trust-related events become available after completing Anby’s Problem, a story mission accessible during Chapter 2 Interlude: Mission Unthinkable. Once this mission is cleared, players gain access to Trust events for agents, eventually leading to rewards like live wallpapers and other cosmetics that commemorate their relationship progression.

Conclusion

Understanding and collecting Key Items is essential for efficient progression in Zenless Zone Zero. These items go beyond basic resources—they serve as milestones, unlock special content, support Agent development, and enable deeper exploration of the game’s systems. Whether you’re summoning powerful Agents, enhancing W-Engines, delving into Hollow Zero, or completing unique Commission quests, Key Items often form the backbone of what allows you to advance. Some of them are tied to narrative progression, while others are linked to important gameplay systems like Trust, upgrades, or account-level advancement. Knowing what each item does—and more importantly, when and how to use or preserve it—can significantly improve your pacing, efficiency, and enjoyment of the game.

Players are encouraged to refer back to this guide regularly as they encounter new Key Items throughout their journey. As Zenless Zone Zero continues to evolve through new updates, events, and story chapters, more Key Items will be introduced—each with its own purpose and significance. Staying informed about what each item means, where it fits in the broader progression system, and how it can be used effectively will help you maximize your time and resources in New Eridu. Treat this guide as a living companion to your Agent work, and return to it whenever you’re unsure about an unfamiliar item or need a refresher on the function of a currency, collectible, or quest token.

As Zenless Zone Zero continues to expand with new updates, events, and Agents, the list of Key Items will grow as well. Future content will likely introduce new currencies, exploration tools, quest items, and collectibles that further deepen the game’s mechanics. Players are encouraged to revisit this guide regularly as new Key Items appear in their inventory or are introduced through game updates. Staying informed ensures you’re always using these valuable resources to their full potential, and not missing out on hidden opportunities for growth or exclusive content.

In summary, Key Items are not just background elements—they’re vital tools for mastering the game’s progression systems, unlocking exclusive rewards, and personalizing your experience in Zenless Zone Zero. By paying close attention to each item’s use, source, and significance, you’ll be better equipped to make smart decisions, power up your Agents, and uncover everything New Eridu has to offer.