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Kaku: Ancient Seal Steam Key: Official PC Key, Instant Delivery

Yes. Every Kaku: Ancient Seal 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. Kaku: Ancient Seal is added to your Steam library right away.
Some keys only work in certain regions. This page shows where this Kaku: Ancient Seal key can be activated before you buy.