Lost In The Backrooms: Day 100

Lost in the backrooms day 100 is a co-op horror game based on the concept of the backrooms with different levels and entities , a sanity system and unreal engine 5 graphics for the best immersive experience.

At a glance

• Platform: Windows.
• Genres: Action, Adventure, Indie.
• Release date: May 26, 2026.
• Steam user reviews: Mostly Positive (73% positive).
• Delivered as a Steam library entitlement — activation is handled by Steam.

Minimum

Recommended

System requirements as published by the developer on Steam.

Activate on Steam

• Open the offer above — it takes you to this game's official Steam store page.
• Buy it there, or if you bought a key elsewhere, open Steam and choose Games → Activate a Product on Steam.
• Enter the product code exactly as it was issued to you.
• The game appears in your Steam library — download and play.

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