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NAMAKORIUM (ナマコリウム)

Namako (Sea cucumbers) will save the Earth—NAMAKORIUM is a chaotic, cooperative multiplayer RTS game for up to four players. Command the “cleaners of the sea” —Namako left behind by humanity and work together to clean up the polluted oceans!

Steam Page
Release
May 18, 2026
76 days ago
Steam Reviews
Very Positive196 reviews94.4%

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Updated: Jul 16, 2026Developer scaleThe operating scale of the game's developer.
Updated: Jul 16, 2026Publisher scaleThe operating scale of the game's publisher.
Updated: Jul 16, 2026Publisher statusHow the game's publishing relationship is classified.
Search Google: How is NAMAKORIUM (ナマコリウム) and Polyscape Inc. funded?FundingThe known source of funding behind the game.
Search Google: Who controls the creative direction and IP for NAMAKORIUM (ナマコリウム) and Polyscape Inc.?Creative controlWho appears to retain creative control of the game.
Updated: Jul 16, 2026Release statusWhether and how the game has been released.

Media

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About the Game

NAMAKORIUM is a chaotic, cooperative multiplayer RTS for up to four players.
Command the "sea cleaners"—Namakos (sea cucumbers) left behind by humanity—and clean up the polluted oceans!
Plus, Solo Mode lets you choose your style: take it slow and chill, or push for peak efficiency!

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 50 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!

Master efficiency in Solo Mode!

Play your way—not just in multiplayer, but solo too!
All stages have been fine-tuned for solo play.
Perfect your strategy and aim for the best time!
Of course, taking it slow and steady is perfectly fine too!

Features

  • Planning x RTS 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 co-op matches where you can easily team up and play with friends or strangers.

  • Over 50 Scenic Creatures: Discover real and fantasy species as you play

  • 16 Unique Stages

  • Stage Titles Based on Clear Time

  • Adorable Sea Cucumbers & a Hidden Post-Apocalyptic Worldview

  • Play Solo Mode: Relaxed or Fully Optimized.

Guidelines for Streaming and Video Posting

  • Streaming and Video Posting: OK (Very welcome!)

  • Monetization: OK

  • Prohibited Streaming Areas: None

  • We would appreciate it if you could include a link to your Steam store page in the description.