[film42]

Apparently this link will show up in your search results, but only when "it finds you" can you login and start the coding challenges.

[akyu]

Can you elaborate? I don't understand.

[film42]

> No puzzle here. You can only log in if Google has flagged your search topics.

> On google search, you have the variable window.location.search = "?gfe_rd=cr&ei=XXXGyZiVNHoFcuF8Qe7wYHACw&gws_rd=ssl"

> That string is appended to the url of the iframe: src="https://foobar.withgoogle.com/"+window.location.search

Check this sub-thread of the other thread https://news.ycombinator.com/item?id=8590155. Someone goes into more depth about it.