Backrooms: Lost Dimension is a narrative horror game with an original story that will expand in chapters through free updates. Play the demo now.

Backrooms: Lost Dimension is a narrative-driven single-player horror game: explore unsettling liminal spaces, solve environmental puzzles, and survive increasingly dangerous encounters.<h2 class="bb_tag" >Key features</h2><ul class="bb_ul"><li>A “liminal” horror atmosphere with a constant sense of tension.</li><li>Unique puzzles integrated into the environment (not just “keys and doors”).</li><li>Guided progression: the game introduces mechanics step by step.</li><li>An original story and levels with distinct identities.</li><li>Free post-launch updates with new levels that expand the nightmare.</li></ul><h2 class="bb_tag" >What the Demo includes</h2>The Demo includes the first three levels of the game, designed as an introductory experience to immerse you in the atmosphere and core mechanics right away.<ul class="bb_ul"><li>Content: Level 1 / Level 2 / Level 3 (intro + escalation).</li><li>Estimated playtime: [15–35 min] (depends on time spent on puzzles).</li><li>Goal: get familiar with exploration, puzzles, and rising tension.</li><li>Saves: [Progress does not carry over] to the full version.</li></ul>If you enjoyed the demo, add Backrooms: Lost Dimension to your wishlist to support development and stay updated.<video class="bb_img" autoplay muted loop playsinline crossorigin="anonymous" poster="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/4262560/extras/fc28415bf54a4878d9279af4f98e9d42.poster.avif?t=1770836616" width=360 height=202 ><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/4262560/extras/fc28415bf54a4878d9279af4f98e9d42.webm?t=1770836616" type="video/webm; codecs=vp9"></video>

Good Game Database

Backrooms Lost Dimension Demo Achievements