Welcome to the latest O2 update! This update introduces Nightmare Mode , a brand-new way to experience O2 for players looking for a greater challenge. Along with the new mode, we've made various gameplay improvements, fixed bugs, improved performance, and poli
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O2 is a simulation video game, released on 10 July 2026 on PC.
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A short deep-sea horror game where you explore a dark and mysterious ocean, photograph strange discoveries, and uncover what lurks beneath the depths.
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