Clear it in 3 steps
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Start the environment
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Investigate the target
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Submit the flag
Websites use a mechanism called cookies to store information in your browser. They're used for managing login states, but sometimes important information is stored in cookies. Check this site's cookies to find the flag!
Press F12 to open Developer Tools → "Application" or "Storage" tab
Select "Cookies" from the left menu
There's a cookie named `secret_flag`