Zenless Zone Zero 2.5 “To Be Fuel for the Night”: Complete Co-Op Guide for Joint Investigation

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For the first time since Zenless Zone Zero launched, the streets of New Eridu are about to get crowded—in the best possible way. Version 2.5, “To Be Fuel for the Night,” introduces the game’s first real-time, combat-focused cooperative mode, called Joint Investigation: The Divine Maze.

This guide gives you everything you need to unlock, master, and dominate this groundbreaking multiplayer event. From prerequisites to advanced team strategies, here’s your all-access pass to making your first co-op run a resounding success.

๐Ÿ—️ How to Unlock Joint Investigation: The Divine Maze

Before diving in, ensure you meet these two simple prerequisites:

Prerequisite                                                            Details
Reach Inter-Knot Level 15Minimum account level required to enter.
Complete the Agent Story: "Mole in the Hole"Narrative quest required to unlock the event.

⏰ Critical Event Schedule

Zenless Zone Zero 2.5 Co-Op Guide

Note: The event doesn’t start immediately with the Version 2.5 launch.

  • Event Start: January 3, 2026, 10:00 AM (Server Time)

  • Event End: January 22, 2026, 3:59 AM (Server Time)

Once live, access it via the Events menu. If you meet the prerequisites, you’ll be able to enter the lobby and start forming your team.

๐Ÿ” How the Co-Op Mode Works: Team Mechanics Explained

Joint Investigation: The Divine Maze is a dedicated 3-player PvE event where teamwork isn’t just encouraged—it’s essential for victory.

Core Gameplay Loop

  1. Select a Themed Stage – Each stage has specific objectives, such as executing a set number of Ultimate attacks or landing Defensive Assists.

  2. Assemble Your Squad – Pick an Agent to control. Role suggestions (DPS, Break, Support) help balance your team.

  3. Master the Chain Overdrive – A shared Chain Meter fills as players perform techniques. When full, all three players can activate a synchronized Chain Attack, dealing massive team-wide damage.

  4. Revive to Survive – Fallen teammates can be revived during battle. Faster revives keep team DPS high and improve success chances.

What Makes This Co-Op Special

This is ZZZ’s first true combat co-op mode, replacing prior casual multiplayer mini-games with high-stakes, strategic combat. It’s the first step toward a more connected New Eridu, where victory depends on team coordination as much as individual skill.

๐Ÿ† Event Rewards

Co-op success comes with exclusive rewards, including:

  • Polychrome (premium currency)

  • Upgrade Materials (Senior Investigator Logs, Denny, etc.)

  • Unique Titles & Namecard to commemorate your achievements

๐Ÿ’ก Pro-Tips for Your First Co-Op Run

  1. Coordinate Roles, Not Just Characters – Balance damage, stun, and support. Three attackers rarely perform as efficiently as a coordinated team.

  2. Communicate the Chain – Use quick chat or voice communication to time your Chain Overdrive for maximum effect on bosses or mobs.

  3. Prioritize Revives – A dead teammate deals no damage. Always revive immediately to minimize DPS loss.

  4. Experiment with Synergy – Test Agent combinations. Buffs, debuffs, and cross-team abilities can create devastating combos.

๐Ÿš€ Ready for Deployment?

The gates to The Divine Maze open on January 3, 2026. Ensure you’ve reached Inter-Knot Level 15 and completed “Mole in the Hole” to join immediately.

Whether you run with friends or queue through matchmaking, this event offers your first true taste of ZZZ multiplayer combat, along with premium rewards and an experience that will change how you play the game.            

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