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Line Challenge is free for anyone to download and try out for 3 days. You get the full complete game and it only takes seconds to install (depending on your computer speed).
Click here --> Install Line Challenge For Windows <-- Click here
When you see a window like this:
Press the "Run" button.
Sometimes computers don't like to download executable files (i.e., with ".exe" on the end). So if you prefer, you can download the compressed zip file (zip file instructions).