~Participating in Steam Ocean Festival 2026 starting May 19~
Polyscape Inc. (Headquarters: Minato-ku, Tokyo; CEO: Hiroki Shimada; hereinafter "the Company"), whose mission is "Bringing the future forward," has begun offering the full version of "NAMAKORIUM," a casual multiplayer RTS starring the "Namakos," the cleaner of the sea. It will be sold for a limited time at ¥900, a 40% discount from the regular price of ¥1,500, which is the largest discount in the game's history.
Coinciding with the official release, a major update has been implemented, including the introduction of boss battles, the addition of five new stages that also support solo mode, and three costume download content sets for the sea cucumbers. Furthermore, new language support for Russian, German, and Brazilian Portuguese will be added.
In addition, the game will participate in Steam Ocean Festival 2026, which will be held from 2:00 AM JST on Tuesday, May 19, 2026.
■NAMAKORIUM Steam Store Page :
https://store.steampowered.com/app/3866920/NAMAKORIUM/
■NAMAKORIUM Release Trailer : https://youtu.be/7JmfpKrBc68
■Official X : https://x.com/namakorium_jp
■Official Discord : https://discord.gg/76Yv3xssUH
[Largest Discount Ever: 40% OFF]
To commemorate the full release, the game will be sold for a limited time at ¥900, which is 40% off the regular price of ¥1,500. This is the largest discount rate in the game's history.
<Discount Period>
From 2:00 AM JST on Tuesday, May 19, 2026, to 2:00 AM JST on Tuesday, May 26, 2026.
<Discount Details>
Regular Price : ¥1,500
Discounted Price : ¥900 (40% OFF)
■NAMAKORIUM Steam Store Page : https://store.steampowered.com/app/3866920/NAMAKORIUM/
[About the Major Update]
Coinciding with the full release, a major update will be implemented, including the addition of new stages and the introduction of boss battles. All added stages are also compatible with solo mode. Additionally, three sets of costume DLC that allow you to change the appearance of the sea cucumbers will be released
<Boss Battle Against the Great Threat "Blight Deity">
The new boss, "Blight Deity," is a fearsome entity that instantly devours any sea cucumber it catches sight of. Since the boss is integrated with the pollution on the stage, sea cucumbers can damage the boss by decontaminating the area. As decontamination progresses, sea cucumbers can hide in the coral that grows, allowing them to escape the boss' sight. Key to defeating the boss is role-sharing among comrades and utilizing the game's fundamental element of "decontamination."
<Five New Stages Added>
Five new stages have been added. With the permanent addition of the two stages previously available only for the "Sea Cucumber Leader Contest" event, the total number of stages is now 16.
■ Wish Upon Seven Stars
A stage with seven "Lighthouses of Blessing" that increase sea cucumber speed when constructed. The key is how much and by whom these are built.
■ Go! Go! Decontaminator Sea Cucumber Car
A stage where players drive the "Decontaminator Sea Cucumber Car," which has a decontamination function. Driving technique will be tested.
■ Duet of Tides and Cannonfire
A stage where various walls block the way. Effective use of the Sea Cucumber Cannon allows for bold shortcuts.
<Three Downloadable Content Sets Featuring Sea Cucumber Costumes>
Three sets of DLC that enable sea cucumber costume changes will be released simultaneously.
・NAMAKORIUM Costume Set Vol. 1 : ¥500
DLC Store Page : https://store.steampowered.com/app/4583220/NAMAKORIUM__Vol1/
・NAMAKORIUM Costume Set Vol. 2 : ¥500
DLC Store Page : https://store.steampowered.com/app/4588240/NAMAKORIUM__Vol2/
・NAMAKORIUM Supporter Pack : ¥1,000
DLC Store Page : https://store.steampowered.com/app/4650760/NAMAKORIUM/
■ Costumes included in Costume Set Vol. 1 (5 types total, ¥500)
・Normal: Ribbon
・Shell Sea Cucumber: Sheep
・Iron Sea Cucumber: Drill
・Flame Sea Cucumber: Fried Egg
・Ice Sea Cucumber: Shaved Ice
DLC Store Page here:
https://store.steampowered.com/app/4583220/NAMAKORIUM__Vol1/
■ Costumes included in Costume Set Vol. 2 (5 types total, ¥500)
・Normal: Hero
・Shell Sea Cucumber: Wild
・Iron Sea Cucumber: Armor
・Flame Sea Cucumber: Phoenix
・Ice Sea Cucumber: Witch
DLC Store Page here:
https://store.steampowered.com/app/4588240/NAMAKORIUM__Vol2/
■ Costume included in the Supporter Pack (1 type total)
・Normal: Cucumber
DLC Store Page here:
https://store.steampowered.com/app/4650760/NAMAKORIUM/
* The Supporter Pack is downloadable content for those who wish to support the game.
* If you are looking for many costume options, please purchase the Costume Sets.
* The "Cucumber" costume is only included in the Supporter Pack.
[Participation in Steam Ocean Festival 2026]
The game will participate in Steam Ocean Festival 2026, which runs from 2:00 AM JST on Tuesday, May 19, 2026, to 2:00 AM JST on Tuesday, May 26, 2026.
The Steam Ocean Festival is a festival targeting games set in the "sea," whether above, under, or in the deep sea. We are participating in the Ocean Festival to deliver NAMAKORIUM to a wider audience, coinciding with the official release and the largest-ever 40% OFF sale.
[Support for New Languages]
Coinciding with the full release, we will begin supporting the following three new languages. We hope this will allow players in more regions to enjoy "NAMAKORIUM."
・Russian
・German
・Brazilian Portuguese
[About NAMAKORIUM]
Modern Earth faces various urgent issues due to human development, such as environmental destruction, abnormal weather, and global warming. In one not-so-distant future of this Earth, severe marine pollution caused by humanity leads to the extinction of many species and the demise of mankind. In the midst of this polluted sea, a certain creature awakens from cold sleep. That creature was the "sea cucumber," the cleaner of the sea.
NAMAKORIUM is a chaotic, cooperative multiplayer RTS game for up to four players. Command the "sea cucumbers," the sea cleaners left behind by the departed human race, and give the polluted sea a major cleanup! Whether or not the beautiful sea can be restored depends on the coordination of you, your comrades, and the sea cucumbers. Now, jump into the chaotic and bustling marine cleanup operation!
[Game Overview]
Title
NAMAKORIUM
Genre
Multiplayer RTS, Simulation
Players
1 to 4
Supported Platform
PC (Windows)
Early Access Start Date
January 30, 2026
Full Release Date
May 19, 2026
Price
¥1,500
Store Page
https://store.steampowered.com/app/3866920/NAMAKORIUM/
Official X
Japanese : https://x.com/namakorium_jp
English : https://x.com/namakorium_en
Official Discord
https://discord.gg/76Yv3xssUH
Youtube
https://www.youtube.com/channel/UC-HzEV4wl0niHVJqioUkGsQ
Developed and Published by
Polyscape Inc.
[About Polyscape Inc.]
Polyscape Inc., with the mission of "Bringing the future forward," is an entertainment technology venture that socializes cutting-edge digital technology, particularly AI, as "products," "services," and "play," thereby pulling the slightly distant future into the present. The company operates two divisions: the [AI/DX Business] which proposes solutions and builds systems to achieve business goals using AI, and the [Game Business] which aims to create new communities and economies for people through play.
<AI/DX Business ( https://aidx.polyscape.io/ )>
Based on the concept of "a specialized group of experts promoting digitalization and AI integration from a CEO-level perspective," this division leverages its end-to-end team structure, from upstream planning to development, to support clients in achieving their business goals from a management perspective.
Character AI development with avatars that interact autonomously with users
Automation of game QA using generative AI and language models
Search agents that find restaurants and accommodations on behalf of people
LINE customer service automation via customer service AI agents
This division specializes in agent-based domains like improving operational efficiency using the latest AI and LLMs, and AI x Entertainment domains such as character AI with avatars.
<Game Business ( https://polyscape.io/service#game )>
With the conviction that "the next-generation virtual economy where people can live will be born from 'play'," this division develops and self-publishes original game content for Steam and Nintendo Switch, aiming to accumulate content business know-how and establish proprietary IP.
Titles developed include "MISTROGUE: Mist and the Living Dungeon" (a 3D Roguelite action game in the style of "Mystery Dungeon") (https://store.steampowered.com/app/2102320/MISTROGUE/) and "Minna no MOZOO," a tech demo game utilizing 3D generative AI technology.
[Company Overview]
Company Name: Polyscape Inc.
Representative: Hiroki Shimada, CEO
Location: Floor 504, Frointo Mita, 2-14-5 Mita, Minato-ku, Tokyo
Date of Establishment: February 22, 2022
Capital: ¥70,099,000 (including capital reserve)
Business Activities: Planning, development, and sales of games and software
Website: https://polyscape.io