The tasks are very easy for humans. Out of the 6 tasks assigned when I opened the web page, I got all of them correct on the first try.
Maybe if you run into some exceptionally difficult tasks it might not be 100%, but there's no way the challenge can be called unfair because it's too difficult for humans too.
Maybe if you run into some exceptionally difficult tasks it might not be 100%, but there's no way the challenge can be called unfair because it's too difficult for humans too.