on the ABC site for week three, the hint is:
s666 – LIAr
I wish I had the exact text of the prior 2 week's hints, so we could group them all together (last week had a collection of A, B and C characters, 11 of them in 2 rows. The first week was something even more cryptic.
But this week's - interesting
666 is generally thought to be Satan. LIAr is a "liar" but why is the r lowercase when the rest is CAPS?