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Nightmare Mode Update · O2 · SteamPeaks

O2NewsNightmare Mode Update

Game update

Nightmare Mode Update

O2 · published 24 Jul 2026, 20:11 UTC

All news Players around this date Read on Steam

Added Nightmare Mode for players seeking a greater challenge.
Improved gameplay balance and immersion.
Fixed various bugs and performance issues.

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Other announcements

Game update24 Jul 2026Nightmare Mode UpdateWelcome 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 polished the overall experience.