Co-op real-time strategy game NAMAKORIUM announced for PC

Due out in Early Access in January 2026.

MISTROGUE: Mist and the Living Dungeons developer Polyscape has announced NAMAKORIUM, an underwater cooperative real-time strategy game for up to four players. It will launch in Early Access for PC via Steam in January 2026.

Here is an overview of the game, via its Steam page:

About
NAMAKORIUM is a chaotic, cooperative multiplayer real-time strategy for up to four players. Command the “sea cleaners”—Namakos (sea cucumbers) left behind by humanity—and clean up the polluted oceans!
Can you reclaim the beautiful sea? It’s all up to your planning skills, your friends, and your trusty sea cucumbers. Get ready for a frantic, action-packed ocean cleanup operation!
Organize Your Namako Operation

Command unique Namakos, gather resources, construct buildings, and clear paths—the tasks are many and time is short.
Purify all the pollution before the food runs out!
Will your strategy hold up under pressure and succeed with the team?
Unique Namakos with Special Traits
Shell Namako gathers limestone. Iron Namako is great at mining. Flame Namako and Ice Namako can survive extreme temperatures.
Use their distinct abilities to assign roles and conquer each stage together!
Restore the Ocean’s Beauty
As you decontaminate, corals bloom, sunlight shines through, and the ocean regains vibrant color.
Over 40 types of “Scenic Creatures” will begin to swim in—try to collect them all as you heal the seas!
Beware the “Blight Namako”!
During cleanup, corrupted Namako known as “Blight Namako” may suddenly appear.
They rot your food and drag the ocean back into darkness.
Team up and repel them with the mighty Namako Fusion Cannon!
Key Features
Planning x Real-Time Strategy Gameplay – Strategize based on map structure and control multiple cucumbers simultaneously
Chaotic Cooperative Play – Plans may succeed… or hilariously fail—every match brings its own story
Online Multiplayer – Join with friends or random players via “Friend Match” or “Random Match.”
Over 40 Scenic Creatures – Discover real and fantasy species as you play.
Eight unique stages.
Stage titles based on clear time.
Adorable sea cucumbers a a hidden post-apocalyptic worldview.
More stages, gimmicks, and creatures are planned in future updates!

Watch the announcement trailer below.

Announce Trailer

English

Japanese