### Solution* When we check at `robots.txt` we find `sitemap.xml`* When looked at `sitemap.xml` we get  > <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><url><loc>https://wk.hexionteam.com/404.html</loc></url><url><loc>https://wk.hexionteam.com/robots.txt</loc></url><url><loc>https://wk.hexionteam.com/.well-known/security.txt</loc></url> </urlset>*  Go to [https://wk.hexionteam.com/.well-known/security.txt](http://wk.hexionteam.com/.well-known/security.txt)  , we get the flag.
> **Flag:**`hexCTF{th4nk_y0u_liv3_0v3rfl0w}`