Developer
Vermillion Digital
metacritic_name
M.A.S.S. Builder
controller_support
full
ReleaseState
released
Publisher
Sekai Project
Store Release Date
15 September 2025 – 00:58:15 UTC (
osarch
64
community_hub_visible
Yes
Social Media
https://discord.gg/sekai-project https://www.facebook.com/massbuilderthegame/ https://www.twitch.tv/sekaiproject https://x.com/massbuildergame https://www.youtube.com/sekaiproject/
Primary Genre
Indie (23)
Store Genres
Action (1) , Indie (23) , RPG (3) , Strategy (2)
Steam Release Date
15 September 2025 – 00:58:08 UTC (
Store Asset Modification Time
15 September 2025 – 01:08:19 UTC (
library_assets
library_capsule en library_hero en library_logo en library_header en logo_position ↴ pinned_position BottomLeft width_pct 38.22994066546616 height_pct 71.96504195361356
osextended
empty string
review_score
8
review_percentage
87
Detected Technologies (?)
Unreal Engine , EpicOnlineServices SDK , Intel_oneTBB SDK , NVIDIA_Nsight_Aftermath SDK , Ogg SDK , Vorbis SDK , XAudio2 SDK
Steam Deck Compatibility
Steam Deck: SteamOS: category: Playable steamos_compatibility: Compatible test_timestamp: 17 August 2022 – 00:00:00 UTC tested_build_id: 8052672 configuration: supported_input gamepad requires_manual_keyboard_invoke 1 requires_non_controller_launcher_nav 1 primary_player_is_controller_slot_0 0 non_deck_display_glyphs 0 small_text 0 requires_internet_for_setup 0 requires_internet_for_singleplayer 0 recommended_runtime proton-7.0-3 requires_h264 0 requires_voice_files 0 gamescope_frame_limiter_not_supported 0 hdr_support 0
Early Access Release Date
13 September 2019 – 00:00:00 UTC (
First seen on SteamDB
2 October 2018 – 04:54:40 UTC ( , in changelist #5167157
