Lost Prototype is free to play on Steam! Also available from 1 official stores starting at $0.00.
Lost Prototype is a ‘game’ created by an unnamed developer.
You are asked to try this game...or ‘prototype’ and find a way out.
Something is hiding in this prototype or someone, we don't know.
Just avoid getting caught.
This game lasts about 10 to 20 minutes and contains flashing lights and sometimes loud noises.
(Lost Prototype is a test ‘game’ to train myself on Unreal Engine and especially to make my steamwork account and stuff).
Before you start looking for a cheap Lost Prototype PC key, check the essentials. Developed by Unsorted Games. Published by Unsorted Games. PC released date: 20 Jun 2025. Genres: Free To Play, Indie. Categories: Single-player.
Lost Prototype is free to play! Download it on Steam and start playing instantly.
Lost Prototype is completely free on Steam. No purchase needed - just download and play. If you are looking for premium DLC or in-game items, check the offers table above.
Our price tracker covers both official retailers and key marketplaces, so you can find Lost Prototype on sale even outside seasonal promotions. We currently detect 1 active offer from official stores and keyshops. Check the table above, compare against the historical low, and set an alert so you never miss the next price drop.
Based on our data, Lost Prototype is not currently available on GeForce NOW. You will need to run it locally on your PC. Browse games available on GeForce NOW.
Yes. Lost Prototype has an official page on the Steam Store. You can also buy a Lost Prototype Steam key from third-party sellers. Our price comparison currently includes 1 offer with Steam DRM. Pick one to ensure your Lost Prototype download happens on Valve's platform.
Not at this time. Valve marks Lost Prototype as Unsupported on Steam Deck. Keep an eye on XD.deals - we track Proton updates and community fixes. Browse games that are Steam Deck Verified or Steam Deck Playable.
Lost Prototype does not appear to be available on PC Game Pass, EA Play, Ubisoft+ or any other PC subscription service at this time. Your only option is purchasing the game - use XD.deals to find the best price.
No - XD.deals is not a store. We are a price-comparison service that tracks the best Lost Prototype deals across official stores and verified keyshops. Click "Go to Store" next to any offer and you will be redirected to the retailer's website to complete your purchase.
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