GAMESMachine Translated summary

Cozy Marbles Marble Run Simulation Game Demo Now Available on Steam with Japanese Language Support

Developer Mythwright released a free demo for Cozy Marbles (ビー玉コロコロ大作戦) on Steam on June 10, 2026. The simulation game lets players build their own custom marble runs using construction tools and course parts, all set to a lo-fi music backdrop for a relaxing experience.

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What we know

  • Demo released on Steam on June 10, 2026 by developer Mythwright
  • Players can design custom marble runs using building tools and course parts
  • Game features lo-fi music to complement its cozy, relaxing atmosphere
  • Full Japanese language support is included in the demo