A 3D action where marimo moss ball fight to survive. Clear around 60 missions as you explore the lake, uncovering hidden items, information, side quests, and lurking threats… Use mission rewards and collected items to upgrade your marimo and take on powerful enemies!

Evolve!For our friends――A 3D action game where marimo algae fight for survival against invading alien species in a lake that has become part of the sea!<h2 class="bb_tag" >● Overview ●</h2>Save Marimo!Strengthen your marimo and wipe out the threats closing in on the Marimo――<ul class="bb_ul"><li>Story ModeStage-based game mode. Take on around 60 different missions, including defeating enemies, sabotaging their operations, and rescuing or defending your allies. Challenge the hard-mode versions of each mission and aim to become the ultimate marimo!<img class="bb_img" src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3750070/extras/09ecd63c57f83de958ac9eb50f2dfc3b.avif?t=1770105323" data-big-src=https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3750070/extras_big/09ecd63c57f83de958ac9eb50f2dfc3b.avif?t=1770105323 width=1560 height=878 /></li><li>Marimo Upgrades Customize your marimo’s abilities freely using items obtained from rewards and exploration! Adapting your upgrades to each situation is the key to overcoming powerful enemies and high-difficulty missions...<img class="bb_img" src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3750070/extras/1d99e4f610c92f3d58b5fa2ec00cfdc8.avif?t=1770105323" width=1560 height=878 /></li><li>Field Exploration Freely explore the lake to discover hidden items, information, side quests, and lurking dangers. The environment may even change as the story progresses…<img class="bb_img" src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3750070/extras/388e999844028f6f54d164db959c7d6f.avif?t=1770105323" width=1560 height=878 /></li><li>Unravel the Mystery in an Optional Sub-StoryHow did the Marimo survive in waters where the environment changed so drastically? How did the lake end up becoming part of the sea? Explore the lake and uncover the truth!</li></ul><img class="bb_img" src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3750070/extras/89015c9bc046dc007d1c55f93ecd56bd.avif?t=1770105323" width=1560 height=878 /><h2 class="bb_tag" >● Story ●</h2>The marimo of Lake Akan once lived peaceful lives. However, rising water temperatures and a lack of sunlight drastically reduced their numbers. With help from humans, they recovered and began to thrive again.But after many years, the lake suddenly turned into seawater, wiping out much of its ecosystem. Invading species from the sea threatened the survivors, pushing the marimo to the brink of extinction.Then, mysterious glowing particles appeared underwater, driving creatures into a frenzy… and granting new power to the remaining marimo.(This story shares the same world and timeline as the previous title, &quot;Marimo-VS-IAS,&quot; but can be fully enjoyed on its own.)

Good Game Database

Marimo-VS-IAS: Our Friends Achievements