Follow these instructions to download and play the "Catch the blue button" game:
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Download the game file called "Catch the blue button.sb3" to your computer - right-click <a href="Catch the blue button.sb3">here</a> and select "Save link as...".
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Open <a href="https://scratch.mit.edu/projects/editor/?tutorial=getStarted">https://scratch.mit.edu/projects/editor/?tutorial=getStarted</a> 
in a new browser window.
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Click "File", then click "Load from your computer", and find the game file you downloaded in the first step.
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Clicking the green flag starts the game. Use the arrow keys to move. Catch the blue button and avoid everything else.