O3 - Hollow Descent is a bullet-hell rogue-like shooter. Set in a surreal world inspired by the art of H.R. Giger and Zdzisław Beksiński.

This demo drops you straight into the core gameplay loop of O3 - Hollow Descent.You’ll begin directly in the dungeon: a hostile, ever-shifting environment filled with randomized rooms, combat encounters, and traps. The focus here is on fast-paced, bullet-hell action and procedural exploration. Fight through alien threats, collect loot, and get a taste of the rogue-like systems and moment-to-moment gameplay.This vertical slice is designed to give you a feel for the atmosphere, controls, and intensity of O3: while the full version will expand the story, environments, and progression systems. <video class="bb_img" autoplay muted loop playsinline poster="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3782050/extras/8722fb05278fb5ecc9636258031f12ce.poster.avif?t=1770888967" width=616 height=170 ><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3782050/extras/8722fb05278fb5ecc9636258031f12ce.webm?t=1770888967" type="video/webm; codecs=vp9"><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3782050/extras/8722fb05278fb5ecc9636258031f12ce.mp4?t=1770888967" type="video/mp4"></video> <img class="bb_img" src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3782050/extras/8eb3028a4b10548f3704571f6c1da57c.webp?t=1770888967" width=600 height=22 />The depths shift and reshape. Traverse ever-changing corridors, evade deadly traps, and fight to escape. <video class="bb_img" autoplay muted loop playsinline poster="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3782050/extras/e6fc8230f86ba2c1c6d0d763fcfdb0de.poster.avif?t=1770888967" width=616 height=170 ><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3782050/extras/e6fc8230f86ba2c1c6d0d763fcfdb0de.webm?t=1770888967" type="video/webm; codecs=vp9"><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3782050/extras/e6fc8230f86ba2c1c6d0d763fcfdb0de.mp4?t=1770888967" type="video/mp4"></video><img class="bb_img" src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3782050/extras/7dea648af91537ea9b69af5e3ad60561.webp?t=1770888967" width=600 height=22 />The dungeon is relentless. Dash through waves of destruction, unleash devastating weapons, and carve a path through the unknown. <video class="bb_img" autoplay muted loop playsinline poster="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3782050/extras/87b30ebb18823dc19dbb121a32eccfce.poster.avif?t=1770888967" width=616 height=170 ><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3782050/extras/87b30ebb18823dc19dbb121a32eccfce.webm?t=1770888967" type="video/webm; codecs=vp9"><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3782050/extras/87b30ebb18823dc19dbb121a32eccfce.mp4?t=1770888967" type="video/mp4"></video><img class="bb_img" src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3782050/extras/8f059cc62fa452ca625e04178017a5eb.webp?t=1770888967" width=600 height=22 />Uncover the unseen and step beyond the veil. Reveal hidden rooms, open abyssal chests, and exchange remnants for powerful upgrades. <video class="bb_img" autoplay muted loop playsinline poster="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3782050/extras/92ab4105cc4aff8dc383d70e98be46a5.poster.avif?t=1770888967" width=616 height=170 ><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3782050/extras/92ab4105cc4aff8dc383d70e98be46a5.webm?t=1770888967" type="video/webm; codecs=vp9"><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3782050/extras/92ab4105cc4aff8dc383d70e98be46a5.mp4?t=1770888967" type="video/mp4"></video>

Good Game Database

O3 - Hollow Descent: Demo Achievements