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Lost Prototype

Wishlist Follow Ignore Install Unwatch Watch
App ID 3487180
App Type Game
Developer
Publisher Unsorted Games
Supported Systems Windows
Technologies Unreal Engine
Last Changenumber 31729642
Last Record Update 17 October 2025 – 14:53:57 UTC ()
Release Date 20 June 2025 – 08:59:37 UTC ()
❓ 75.77%
30 reviews
1
In-Game
😱 Horror 🚶 Walking Simulator 🙌 First-Person 📏 Linear 🗺️ Adventure

Lost Prototype is a walking simulator in which you have to find your way out of a maze under construction. But be aware, you're not alone in this place. Something is following you and wants to erase all your progress.

Additional Information

This game is excluded from Steam Family Sharing because: Free Game

Developer Unsorted Games
ReleaseState released
Publisher Unsorted Games
IsFreeApp Yes
Exclude from family sharing (exfgls) 3 (Free Game)
Store Release Date 20 June 2025 – 08:59:37 UTC ()
osarch empty string
community_hub_visible Yes
Primary Genre Indie (23)
Store Genres Indie (23), Free to Play (37)
Steam Release Date 20 June 2025 – 08:59:37 UTC ()
Store Asset Modification Time 28 June 2025 – 18:14:27 UTC () (1751134467)
library_assets
library_capsuleen
library_heroen
library_hero_bluren
library_logoen
library_headeren
logo_position ↴
pinned_positionUpperCenter
width_pct52.485474499677196
height_pct171.875
osextended empty string
Is free on the store? Yes
review_score 7
review_percentage 90
Detected Technologies (?) Unreal Engine, Intel_OID SDK, Intel_oneTBB SDK, NVIDIA_Nsight_Aftermath SDK, Ogg SDK, Vorbis SDK, XAudio2 SDK
controllertagwizard Yes
First seen on SteamDB 23 January 2025 – 12:54:38 UTC (), in changelist #27130587

Supported Languages

1 Languages Interface Full Audio Subtitles
English Yes Yes Yes

Tags

😱 Horror 👤 Singleplayer 🚶 Walking Simulator 🙌 First-Person 📏 Linear 🗺️ Adventure 🆓 Free to Play 🌱 Indie

Categories

Single-player Profile Features Limited

Assets

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header_image
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library_assets_full
library_capsule ↴
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library_hero ↴
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library_header ↴
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Assets
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timestamp28 June 2025 – 18:15:09 UTC

Trailer 873599 ↴

trailer_name Small trailer
trailer_category 2
trailer_480p ↴
video/webm 257128121/movie480_vp9.webm
video/mp4 257128121/movie480.mp4
trailer_max ↴
video/webm 257128121/movie_max_vp9.webm
video/mp4 257128121/movie_max.mp4
microtrailer ↴
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video/mp4 3487180/873599/9c9cdf35f44715d598026a35f920e338c466b2e6/1750855213/microtrailer.mp4
adaptive_trailers ↴
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dash_h264 3487180/873599/9c9cdf35f44715d598026a35f920e338c466b2e6/1750855213/dash_h264.mpd
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screenshot_full 257128121/33acce12aa10658b5bd64a387b82e831f4c986f4/movie_full.jpg
all_ages true
is_highlight true
timestamp 6 June 2025 – 09:18:52 UTC

Configuration

Key Value
installdir Prototype 1 The Rooms
uselaunchcommandline 1

Launch Options

0. Unnamed launch option
Executable Lost_Prototype.exe
Launch Type Launch (Default)
Operating System   windows
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