If you only want to experience the game for a weekend, log into your Steam account on a friend's computer who owns the game. Download it via their library, then go offline mode. You can play the full career mode for 2-3 days offline before Steam requires a re-authentication.
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Once you have secured your copy of Planet Zoo , you can use the Steam Workshop to download thousands of free, community-created blueprints, habitats, and structures, immediately increasing the value of your game without spending another penny [5.2]. Conclusion planet zoo steam key free