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O3: Hollow Descent is a fast-paced top-down rogue-like shooter set in a dark, biomechanical sci-fi world.

You play as a lone astronaut descending into a hostile alien planet, fighting room by room through shifting labyrinths filled with traps, creatures, and escalating threats. Combat is precise and dodge-focused, built around quick dashes, reactive shooting, and randomized weapons that reshape your build every run.

Each descent is different.
Each death is part of the loop.
Push deeper. Learn faster. Return stronger.

Inspired by the haunting atmosphere of H. R. Giger and Zdzisław Beksiński, O3 blends oppressive sci-fi environments with tight, skill-driven combat.

Procedurally generated rooms reshape every run.
Navigate arena-style encounters, avoid deadly traps, and adapt to new layouts as you descend.

Engage in intense bullet-hell combat using fast dashes and responsive shooting.
Master enemy patterns and clear each room to progress.

Discover powerful weapons and a range of active and passive abilities that shape your build each run.
Break into hidden rooms, open secret chests, and uncover rewards hidden beyond the obvious path.