Released Sep 14, 2025
$24.99 Very Positive
M.A.S.S. Builder
By Vermillion Digital · published by Sekai Project
Followers
—
Reviews
3,734
Very Positive
Players yesterday
6
at the busiest moment
Owners
100K–200K
estimated
Steam data
Everything Steam lists for M.A.S.S. Builder · record updated 1 day ago
Overview
App ID956680
Release dateSep 14, 2025
Last change number39323160
Last record update1 day ago
App info
- App type
- Game
- Developer
- Vermillion Digital
- Publisher
- Sekai Project
- Steam profile
- Counts toward game count and achievement totals · checked Nov 1, 2025
- Website
- v-dgt.com
Platforms
Windows
64-bit
- Steam Deck
- Playable
- Controller
- Full support
Features
7
Single-playerFull controller supportSteam CloudMulti-playerCo-opOnline co-opFamily Sharing
Patches
Builds
1| Build | Branch | Updated |
|---|---|---|
| 20064677 | public | Sep 21, 2025 |
Depots
Depots
3| ID | Name | Systems | Size | Download | Manifest |
|---|---|---|---|---|---|
| 228986 | — shared from 228980 | Windows | — | — | — |
| 228990 | — shared from 228980 | Windows | — | — | — |
| 956681 | — | All | 10.08 GB | 9.86 GB | 4042782009741536299 |
Branches
1| Branch | Build | Updated | Access |
|---|---|---|---|
| public | 20064677 | Sep 21, 2025 | Open |
Configuration
Install foldersteamapps/common/M.A.S.S. Builder
Launch options
1| Executable | Arguments | Systems | Description |
|---|---|---|---|
| MASS_Builder.exe | -novr -nohmd | Windows · 64-bit |
Cloud saves
Space per player95.4 MB
Filesup to 50
Save locations1
| Root | Path | Pattern | Systems |
|---|---|---|---|
| WinAppDataLocal | MASS_Builder/Saved/SaveGames | *.sav | Windows |
Data from public Steam pages, updated daily; 1 day of history. Owner counts are estimates. LaunchRivals is not affiliated with Valve or Steam.