>observer_
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Use your CD key on Steam to download >observer_.
Use your Xbox One >observer_ game code on the Xbox Live
Download >observer_ on Switch with the Nintendo eShop
>observer_ will be sent to you as a Steam gift link without any geographic restriction.
>observer_
For Steam CD Keys, you must download (HERE), install the Steam software and create a new account. If you already have a Steam account, once you log in, click "Add a game" (located in the bottom left corner), and then "Activate a Product on Steam". After a few more clicks, you will be prompted to type in your CD Key. Thus, the game will be activated and automatically added to your account library.
To use a Steam gift game, you need to own a Steam account and use the link provided to add the game to your library.
This is Nintendo's download platform. After buying a Nintendo Switch game, you will receive a download code. Start the Nintendo eShop from the Home menu, select Settings/Other, and then tap "Redeem Download Code" to enter your 16-diogits code which will allow you to download your game.
Activation of your Membership is restricted to United States.