Video Game Data

Commander, customize and build your Mechanical Assault Skeleton Suit (M.A.S.S.) and lead the fight against an alien invasion bent on exterminating the human race. The fate of humanity is in your hands.

Developer: Vermillion Digital

Publisher: Sekai Project

Genres: Action Early Access Indie RPG Strategy

Tags: Action Action RPG Anime Character Customization Combat Crowdfunded Futuristic Gun Customization Hack and Slash Indie Mechs Multiplayer Post-apocalyptic RPG Robots Sci-fi Shooter Singleplayer Third Person Third-Person Shooter

Release Date: Sept. 14, 2025

Reviews: 3654 (Followers)

Followers: 58780

Platforms: Windows

Languages: English, Japanese, Simplified Chinese, Thai, Traditional Chinese

Steam Achievements: None

Estimated Sales: $2,739,403

Estimated Wishlists: 705,360

M.A.S.S. Builder on Steam

Categories: Co-op Family Sharing Full controller support Multi-player Online Co-op Single-player Steam Cloud