🛠️ Observer: System Reduxのアップデート履歴
開発元がSteamで公開した公式告知（パッチ、新コンテンツ、イベント）を時系列でまとめています。タイトルをクリックすると全文を読めます。
2026年10月
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10/3土🎉 イベントObserver System Redux is 80% off during Autumn Sale!
Observer: System Redux is 80% off during the Steam Autumn Sale! Hack into the minds of criminals, uncover disturbing memories and investigate a dark cyberpunk future. 🤖 Observer: System Redux is 80% o…
2026年6月
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6/29月🎉 イベントObserver: System Redux is 75% off during Summer Sale!
Using a device known as the Dream Eater, hack into the minds of the dead and dying to relive their final moments. Dive into Observer: System Redux at a special Summer Sale price on Steam. Explore our …
2026年3月
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3/20金🎉 イベントObserver: System Redux is 75% off during the Spring Sale!
A reality-bending, addictive fusion of horror and cyberpunk. Immerse yourself in a dark detective story set in a decaying, neon-scarred future. Dive into Observer: System Redux at a special Spring Sal…
2025年12月
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12/19金🎉 イベントObserver: System Redux — 75% Winter Sale Discount!
Dive into corrupted minds, uncovering crimes and horrors hidden deep within broken memories. As an elite neural detective, you explore the darkest corners of the human psyche in a decaying cyberpunk f…
2025年9月
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9/30火🎉 イベントObserver: System Redux is 70% off during the Steam Autumn Sale!
This autumn, jack into the rainy cyberpunk nightmare that is 2084 Kraków! Observer: System Redux is now 70% off during the Autumn Sale on Steam! 🍂 Get it now before October 6: https://store.steampower…
2025年3月
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3/15土🎉 イベントObserver: System Redux is 70% off during Steam Spring Sale!
Forget sunshine. In the gloomy streets of 2084 Kraków it’s always raining… Get Observer: System Redux for 70% off during the Steam Spring Sale before March 20! Get it here: https://store.steampowered.…
出典：Steam公式告知（6～24時間ごとに更新）。タイトルと概要の著作権は各開発元に帰属します。