Flat 9
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About Flat 9
Flat 9 is a psychological horror game in which you investigate an abandoned apartment and document strange occurrences with the A.D.D. (Anomaly Detection Device), a tool that can detect and repair irregularities. As you explore, objects move on their own, shadows flicker unpredictably and unnatural events appear.
Find the anomalies
You are trapped in a loop and must identify every anomaly in the apartment to advance to the next floor. Miss even one, and you return to the previous floor. You need to address each anomaly you encounter and find a way out of Flat 9.
Some anomalies are easy to spot, while others are subtle and require closer observation. A playthrough takes 30–60 minutes.
Frequently asked questions
The best price for Flat 9 is $3.99 at Steam. It is the only shop with an offer that activates in your country.
The minimum requirements for Flat 9 are: Windows 10, GeForce GTX 1060, Intel Core i7-4790, 8 GB RAM, 4 GB storage. It runs on Windows only. The recommended specs are in the System requirements section.
No. Flat 9 is a single-player game.
Yes. Flat 9 is the full base game. You need nothing else to play it.
Steam lets publishers create keys to sell in other shops. Once you activate a key, the game is yours to keep, just like a store purchase.
Disclaimer: CD keys have an inherent 1–2% average failure rate. Check the shop terms for buyer protection info. Steam offers no buyer protection for keys bought in other shops and doesn't refund them.











