Whilst surfing you happen to stumble upon a "hackers" website that is part of a ring of thirteen; each site linking to the next one, until returning to the first. Curiously one of them requires a password and as you cycle through the front pages of the other twelve you notice some strange figures in the bottom right corner. It was not obvious, because each time the web page designer has chosen a colour only slightly different to the background.
Assuming that the password protected site is the last in the ring, you write down the codes from each site sequentially to form a string.
Can you unlock the password?