M.A.S.S. Builder

Platforms

• Microsoft Windows

Genres

• hack and slash

• action game

• third-person shooter

• shooter game

Play modes

• co-op mode

• single-player video game

Players by platform

• Microsoft Windows^*

  Maximum players (mode unspecified)

  1^*

Content classifications

• ESRB · Microsoft Windows^*

  Classification

  T - Teen^*

Steam version platforms

• Windows^*

  Supported

  Yes^*

• macOS^*

  Supported

  No^*

• Linux^*

  Supported

  No^*

Store genres

• Action^*
• Indie^*
• RPG^*
• Strategy^*

Game features

• Single-player^*
• Multi-player^*
• Co-op^*
• Online Co-op^*
• Full controller support^*
• Steam Cloud^*
• Family Sharing^*

Interface languages

• English^*
• Japanese^*
• Simplified Chinese^*
• Thai^*
• Traditional Chinese^*

Community tags · historical

• Early Access^*

  Votes · historical

  350^*

• Action RPG^*

  Votes · historical

  318^*

• Mechs^*

  Votes · historical

  316^*

• Character Customization^*

  Votes · historical

  305^*

• Robots^*

  Votes · historical

  299^*

• Gun Customization^*

  Votes · historical

  276^*

• Indie^*

  Votes · historical

  276^*

• Hack and Slash^*

  Votes · historical

  273^*

• Sci-fi^*

  Votes · historical

  268^*

• Anime^*

  Votes · historical

  262^*

• Shooter^*

  Votes · historical

  252^*

• Action^*

  Votes · historical

  247^*

• Singleplayer^*

  Votes · historical

  236^*

• RPG^*

  Votes · historical

  234^*

• Futuristic^*

  Votes · historical

  223^*

• Multiplayer^*

  Votes · historical

  221^*

• Third-Person Shooter^*

  Votes · historical

  217^*

• Combat^*

  Votes · historical

  215^*

• Third Person^*

  Votes · historical

  211^*

• Post-apocalyptic^*

  Votes · historical

  209^*

System requirements

• Windows · Minimum^*

  Operating system

  Windows 7, Windows 8.1, Windows 10 (64-bit versions only)^*

  Processor alternatives

  Intel Core i5 or better / AMD Phenom II X3 or better^*

  Memory

  8 GB RAM^*

  Graphics alternatives

  NVIDIA GeForce GTX 1050 or better / AMD Radeon RX 560 or better^*

  Storage

  3 GB available space^*

  Audio hardware

  DirectSound Compatible^*

  Conditions

  Requires a 64-bit processor and operating system^*

Compatibility and community reports

• Controller support · 2026-06-27^*

  Controller support

  Full^*

• Steam Deck · 2026-06-27^*

  Compatibility category

  Playable^*

• Linux · Community reports · 2026-06-27^*

  Community Linux compatibility tier

  Gold^*

  Reports

  19^*

  Community confidence

  good^*

Developers

• Vermillion Digital

Publishers

• Sekai Project

• 2019-09-13

  Date precision

  Exact date

• 2019-09-13 · Microsoft Windows^*

  Release date

  2019-09-13^*

  Date precision

  Exact date^*

  Platform

  Microsoft Windows^*

Store release history

• Steam^*

  Release date

  Sep 14, 2025^*

Detailed specifications