Zenless Zone Zero “Ding-Dong! Delivery Training in Progress” Event Guide: Dates, Requirements, Wish Letters, and Rewards
The “Ding-Dong! Delivery Training in Progress” event runs from August 28, 2026, at 10:00 server time, until September 14, 2026, at 03:59 server time. During the event, Proxies help Bangboo deliver Wish Letters while collecting Polychrome rewards.
Players must reach Inter-Knot Level 20 and complete Main Story Chapter 1 - Intermission before participating. The event begins with an interaction with Batti in Booastrum, who asks Proxies to help with the Bangboo delivery activity.
The event uses a simple daily collection system. Players can obtain up to two Wish Letters per day, with one available from their first login and another from their first Battery consumption each day.
“Ding-Dong! Delivery Training in Progress” Event Summary
The event is built around collecting and delivering Wish Letters rather than completing a long series of conventional combat commissions. Players can earn letters through two daily actions, then deliver the required amount to receive Polychromes.
This makes the event easy to follow once you meet the participation requirements. The main task is to log in, consume Battery, collect the available Wish Letters, and deliver enough letters for the corresponding rewards.
| Event Detail | Confirmed Information |
|---|---|
| Event name | Ding-Dong! Delivery Training in Progress |
| Game | Zenless Zone Zero |
| Start date | August 28, 2026, at 10:00 server time |
| End date | September 14, 2026, at 03:59 server time |
| Location | Booastrum |
| NPC | Batti |
| Required Inter-Knot Level | Level 20 |
| Story requirement | Main Story Chapter 1 - Intermission |
| Event item | Wish Letters |
| Daily Wish Letters | Up to 2 per day |
| Main reward | Polychromes |
Who Can Participate in the Event?
Players need Inter-Knot Level 20 and Main Story Chapter 1 - Intermission to access the event. Players must complete both requirements before participating.
The level requirement means newer Proxies may need to progress through regular game content first. Reaching Level 20 alone is not sufficient if the required story chapter remains unfinished.
Inter-Knot Level 20 Requirement
The event is available to players who have reached Inter-Knot Level 20. This places the event beyond the earliest stages of account progression.
Players below Level 20 should continue completing available game content until they reach the required level.
Main Story Chapter 1 - Intermission
Players must also finish Main Story Chapter 1 - Intermission. This story requirement works alongside the Inter-Knot Level requirement.
If the event doesn't appear after reaching Level 20, check whether this chapter is complete.
How to Start the Delivery Event
Players can begin the activity by speaking with Batti in Booastrum. Batti is the key NPC connected with the Wish Letter delivery activity.
After starting the event, Proxies can help the Bangboo deliver Wish Letters. The event then becomes a daily resource collection routine.
Visit Batti in Booastrum
Booastrum is the event's main location. Find Batti there and interact with the NPC to participate.
The event does not require players to search for a separate location each day. Batti connects players to the Bangboo delivery activity.
Help the Bangboo Deliver Wish Letters
The main event objective is to help the Bangboo deliver Wish Letters. Players collect these letters through the event’s daily actions and use them toward the delivery requirements.
Check the number of letters required for each reward in the event interface, as the official announcement confirms the delivery-based reward structure but doesn't provide a complete reward-threshold list in the supplied details.
How to Get Wish Letters Every Day
Players can collect up to two Wish Letters per day. These two opportunities come from different daily actions, so both login and Battery use matter for consistent progress.
The first Wish Letter comes from the player’s first login of the day. The second becomes available after the player’s first Battery consumption that day.
| Daily Action | Wish Letters Available | Frequency |
|---|---|---|
| First login of the day | 1 Wish Letter | Once per day |
| First Battery consumption of the day | 1 Wish Letter | Once per day |
| Maximum daily total | 2 Wish Letters | Per day |
First Login Gives One Wish Letter
Players can receive one Wish Letter when they first log in each day during the event. This makes daily login the first step toward collecting the maximum available amount.
Players who only want to maintain basic event progress should therefore remember to log in during the active event period.
First Battery Consumption Gives Another
The second daily opportunity comes from the player’s first Battery consumption of the day. This provides one additional Wish Letter.
Players who want to reach the daily maximum should therefore complete both actions rather than relying only on the login reward.
How the Wish Letter Delivery System Works
The event rewards players after they deliver a set amount of Wish Letters. Collecting the letters is therefore only part of the process.
Once enough Wish Letters have been obtained, players can use them for the required deliveries. Completing those delivery milestones provides Polychrome rewards.
Collect Before Completing Deliveries
Players should track their accumulated Wish Letters through the event interface. The letters function as the event’s main progression resource.
The daily limit of two letters also means progress is tied to the number of days a player participates. Missing daily opportunities can reduce the number of letters collected during the event period.
Delivery Milestones Provide Polychromes
The main confirmed reward is Polychromes. Players receive these rewards after delivering the required amount of Wish Letters.
The official event details do not provide a complete list of every delivery threshold or the exact number of Polychromes associated with each milestone. Players should check the in-game event page for those values.
How to Maximize Daily Event Progress
Players can maintain steady progress by completing both daily Wish Letter actions. The routine requires a login and the first Battery consumption of the day.
This approach lets players collect up to two Wish Letters per day through these activities.
Daily Checklist
A simple routine can prevent missed event progress:
Log in during the event period.
Collect the first Wish Letter.
Consume Battery for the first time that day.
Collect the second Wish Letter.
Check the event interface for delivery requirements.
Deliver enough Wish Letters when a milestone becomes available.
Collect the resulting Polychrome rewards.
This process does not require players to complete both actions at the same time. The important point is completing the relevant daily actions before the event ends.
When Does the Event End?
The event ends on September 14, 2026, at 03:59 server time. Players should complete their final deliveries before this deadline.
Because the event uses daily collection opportunities, waiting until the final day may limit the number of Wish Letters available. Players who participate throughout the event can make use of more daily collection opportunities.
Why the Daily Limit Matters
The maximum of two Wish Letters per day creates a predictable progression system. Players cannot simply collect an unlimited number of letters in one session.
This structure makes regular participation more important than spending a long period on the event at once.
What Rewards Can Players Get?
Players can earn Polychromes by delivering set amounts of Wish Letters. Polychromes are the main reward category explicitly identified in the event announcement.
The official details don't state the exact number of Polychromes available at each delivery milestone. For accurate reward quantities, players should refer to the event interface once the activity is available.
For North American fans who follow Zenless Zone Zero beyond in-game events, Animon Life can also help track official merchandise availability. Merchandise releases and in-game event rewards remain separate, so players should use the appropriate official source for each type of information.
Final Takeaway
The “Ding-Dong! Delivery Training in Progress” event gives Zenless Zone Zero players a daily way to collect Wish Letters and earn Polychromes. It runs from August 28 at 10:00 server time through September 14 at 03:59 server time.
Players need Inter-Knot Level 20 and Main Story Chapter 1 - Intermission to participate. After meeting those requirements, they can visit Batti in Booastrum and begin helping the Bangboo deliver Wish Letters.
The daily system provides one Wish Letter on first login and another after the first Battery consumption, for a maximum of two each day. Delivering the required number of letters then unlocks Polychrome rewards.
Frequently Asked Questions
When does “Ding-Dong! Delivery Training in Progress” start?
The event starts on August 28, 2026, at 10:00 server time.
When does the event end?
The event ends on September 14, 2026, at 03:59 server time.
How many Wish Letters can players get each day?
Players can obtain up to two Wish Letters per day through the specified activities.
How do players obtain the two Wish Letters?
One Wish Letter comes from the first login of the day, while another comes from the first Battery consumption of the day.
Where does the event take place?
Players can speak with Batti in Booastrum to participate in the Bangboo delivery activity.
What rewards does the event provide?
Players can obtain Polychromes by delivering set amounts of Wish Letters.
Animon Life continues to follow and update official merchandise releases like this for North American customers.
