Version 3.1 New Eridu City Fund: Rewards & Guide

The New Eridu City Fund returns in Zenless Zone Zero Version 3.1, offering proxies a familiar battle pass structure with refreshed rewards. Whether you're free-to-play or considering a paid plan, understanding what each tier provides is key to maximizing your Polychrome and upgrade materials. For the latest coverage on all ZZZ events, check our Zenless Zone Zero news.

At a Glance

• Event Duration: From Version 3.1 update until 2026-09-07 03:59 (server time). Purchase closes on 2026-09-07 02:59.
• Requirements: Unlock Combat Simulation in Chapter 1 "Cat's Lost & Found".
• Basic Plan is automatically unlocked; complete Expansion Tasks for Fund Level XP.
• Growth Plan (680 Polychrome + exclusive avatar "Berry Party") and Premium Plan (additional 208 Polychrome, menu decoration, W-Engine Microcontroller Unit, Resonating Core, Ether Batteries) are paid upgrades.
• Reaching City Fund Level 30 in any paid plan grants the Great Builder's Certificate, a time-limited reward that expires after the event.

Event Duration & Key Dates

The New Eridu City Fund runs from the Version 3.1 update through 2026-09-07 at 03:59 server time. However, the purchase window for the Growth Plan, Premium Plan, and Plan Upgrade closes two hours earlier, at 2026-09-07 02:59. After that, you can still complete Expansion Tasks and claim earned rewards until the event ends.

Reward Tiers Breakdown

Basic Plan (Free)

Automatically unlocked for all proxies. By completing daily and weekly Expansion Tasks, you gain Fund Level experience to claim free rewards. These typically include standard upgrade materials, Denny, and other consumables.

Growth Plan

Costs 680 Polychrome worth of premium currency (or real money equivalent) and grants immediate rewards:
– Polychrome ×680 (instant)
– Exclusive avatar "Berry Party"

Additionally, progressing through Fund Levels while on this tier yields exclusive rewards including the namecard "Time for Afternoon Tea", W-Engine Microcontroller Units, Resonating Cores, Hamster Cage Passes, and selectable upgrade material bundles.

Premium Plan

If you already own the Growth Plan, you can upgrade via the Plan Upgrade to the Premium Plan. This adds:
– Polychrome ×208 (instant)
– Menu decoration set
– W-Engine Microcontroller Unit
– Resonating Core
– Ether Batteries

The Premium Plan also unlocks the same level-based rewards as the Growth Plan, but with increased quantities and additional exclusive loot.

Note: The Great Builder's Certificate, obtainable at Fund Level 30, is a time-limited item that cannot be carried over to the next City Fund season. Use it before the event ends.

F2P vs Paid Considerations

For free-to-play players, the Basic Plan still offers meaningful value. Complete Expansion Tasks consistently to farm upgrade materials and small Polychrome amounts. Focus on reaching the highest Fund Level possible without spending.

Low-spend and dolphin players should evaluate the Growth Plan first. At 680 Polychrome, you get that amount back instantly (effectively free avatar) plus exclusive level rewards. The Premium Plan adds 208 Polychrome and premium materials, making it a solid value if you regularly purchase Polychrome packs.

Whales may opt for the Premium Plan immediately, as the additional W-Engine Microcontroller Units and Hamster Cage Passes accelerate character and engine progression.

Should You Invest?

The New Eridu City Fund is the most consistent way to convert Polychrome into long-term resources. If you play ZZZ daily, the time investment to reach higher Fund Levels pays off in materials that would otherwise cost significant energy. The exclusive avatar and namecard are cosmetic bonuses, but the W-Engine Microcontroller Units and Resonating Cores are rare materials that make the paid tiers worthwhile for anyone building multiple characters.

Final Takeaway

Mark your calendar for the purchase deadline on 2026-09-07 02:59. Complete Expansion Tasks efficiently to avoid missing out on the Great Builder's Certificate. For more detailed guides and banner schedules, explore our Zenless Zone Zero guides.