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steam://open/consolein your browser
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It should do the same as the instructions in
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To verify, go to the Store pages and you should see text like this:
Quote
Puzzle - LINES AND KNOTS: Levels Pack 2 is already in your Steam library
How do I know the numbers from above? They're in the store links:
https://store.steampowered.com/app/1227750/Puzzle__LINES_AND_KNOTS/
Tags: addfreelicense !asf register free license steam