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Subterrain: Mines of Titan Steam Key: Official PC Key, Instant Delivery

Yes. Every Subterrain: Mines of Titan key we sell comes from a distributor authorized by the publisher.
Open Steam, click Games, choose "Activate a Product on Steam", then paste your key. Subterrain: Mines of Titan is added to your Steam library right away.
Some keys only work in certain regions. This page shows where this Subterrain: Mines of Titan key can be activated before you buy.