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A few practical things to know:

• If you come back on the same browser/device, your progress is saved and you pick up where you left off. That's a feature, not a bug, it means you don't have to start over if you close the tab.
   

• If you switch to a different browser or device (phone vs laptop), you start fresh on that device. Progress doesn't follow you across devices.
   

• Clearing browser history/cache also resets your progress.