Mop-Up Operation guide for Kaiju No. 8 The Game (K8 The Game). See the event period, best characters and teams, rewards, and how to get the rare 5-star Unimaterial.
Table of Contents
Mop-Up Operation Event Period
Mop-Up Operation
| Event Period | Dec 26, 2025 - Jan 8, 2026 (PST) |
|---|
Following the defeat of Kaiju No. 10 in the Raid Battle, the new "Mop-Up Operation" is now live! In this event, you must neutralize a massive horde of Kaiju until every last one is defeated. In addition to rewards like Reinforcement Materials and Unimaterials, you have a rare chance to drop valuable 5-Star Unimaterials, so be sure to take on the challenge.
What Is the Mop-Up Operation?
A Competitive Event for All Players
| Event Period | Dec 26, 2025 - Jan 8, 2026 (PST) |
|---|
The Kaiju No. 8 Mop-Up Operation is a large-scale competitive event where all players work together to neutralize as many Kaiju as possible.
Neutralize as Many Kaiju as Possible
The Mop-Up Operation consists of 5 rounds. You'll earn better rewards by neutralizing more Kaiju in a single battle, so aim to take down as many as you can within the 5-round limit.
Up to 5 Free Attempts Per Day
You need Permits to attempt the Mop-Up Operation. You'll receive 5 Permits daily during the event, so make sure to use all 5 attempts every day. If you run out, you can replenish attempts using 20 Dimensional Crystals. However, since Dimensional Crystals are valuable resources, use them wisely.
How to Farm Dimensional Crystals
Permits Are Consumed on Retreat
In the Mop-Up Operation, the battle ends immediately if you interrupt the app, get defeated, or choose to retreat. You will still receive rewards based on the number of Kaiju defeated up to that point. However, please be aware that your ticket will be consumed even in these cases.
Mop-Up Operation Best Characters
Prioritize Characters with Multi-Target Attacks
The Mop-Up Operation pits you against waves of enemies simultaneously. Focus your team on characters with AoE or Blast Attacks to maximize the number of Kaiju neutralized per round.
Midsized Enemies Grant 3x Neutralization Count
Keep an eye out for the midsized "Nesodactyl" enemies! Neutralizing one of these grants 3 points to the neutralization count compared to regular Kaiju. If you’re low on SP (Skill Points) for multi-target attacks, prioritize these high-value targets to maximize your score.
Recommended Team
 Rin Shinonome |  Isao Shinomiya |  Mina Ashiro |  Kikoru Shinomiya |
This team excels at mass neutralization: Rin Shinonome provides fast Ultimate attacks with AoE damage, while Mina Ashiro (with her Extra Attack) and others focus on multi-target damage. The goal is to chain these abilities to clear waves quickly.
| Tip! | The example above isn’t the only option; characters like Soshiro Hoshina (Hoshina-Style Sword-Slay Technique) also work great for multi-target damage. |
Best Characters
| Character | Reason |
| Rin Shinonome | - AoE Attacker - Boosts DMG with every attack - Recharges Ultimate on kill |
| Isao Shinomiya (Prime) | - Blunt AoE Attacker - Self-buffs Crit Rate - Bonus Blunt DMG at max Valor |
| Mina Ashiro | - Blast Attacker - Extra Attack via Combined Forces |
 Soshiro Hoshina | - AoE Combat Skill - Self-buffs SPD and advances Action Order |
| Kikoru Shinomiya | - Blast Attacker - Easy to use her Ultimate thanks to self-buffs |
 Akari Minase | - Blast Attacker - Ultimate deals AoE damage |
 Gen Narumi | - Blast Attacker - Buffs DMG/SPD based on Ultimate Gauge |
 Kafka Hibino | - AoE Attack after Transformation - Can be fully Ascended (A6) for free |
 Haruichi Izumo | - Blast Combat Skill - AoE Ultimate |
Mop-Up Operation Rewards
Obtain Unimaterials and Reinforcement Materials
Mop-Up Operations enable you to earn rewards, including Unimaterials and Reinforcement Materials. There are five sectors available, and rewards differ for each sector, so be sure to challenge the one containing the materials you need.
Rare 5-Star Unimaterials in All Sectors
You also have a rare chance to obtain valuable 5-Star Unimaterials from any Mop-Up Operation sector. A 5-Star Unimaterial guarantees the development of a 5-Star Unipart.
Kaiju 8 The Game Related Guides
Recommended Guides
| Popular Articles | ||
|---|---|---|
| Reroll Tier List | Best Characters | Best Squads |
| Early Game Guide | Daily to Do | Paid Packs |
| Character List | Weapon List | Uniparts List |
Other Articles
How to Reroll
Best Free 5 Star
Best 4-Stars
Best Banner
Gacha Animation
Pulls Until Guaranteed?
Enhance Priority
Squad Setup
Web Store
Redeem Codes
Latest Updates
Controller Support
Element Effects and Plate Mechanics
Best Store Purchases
Action Order
How to Disassemble Weapons
Weapon Exchange Shop
Uniparts Farming Guide
Weapon Ascension
Emblem of Defense
Identified Kaiju Neutralization
Kaiju Core MaterialMust Reads Before Playing
| Useful Info | ||
|---|---|---|
| Pre-Registration | Required Specs | Steam Release |
| Link Data | Data Transfer | Best Settings |
| How to Fix Lagging | PS5 ver? | Voice Actors |
