Puzzle sites?

Question

Burglary protection

Greetings!
I came across an ad on vc.ru today - with a "puzzle" site . I remember that before I came across similar and even better ones.
Who knows similar, throw links?
Thank you in advance!
PS I did not find suitable tags

Answer 1

guess the cicada , why trifle)

Answer 2

I was interested in the site, I wrote a sorter of numbers, it doesn’t fit,
but there you can insert letters,
did you figure it out? (I found the inscription on the wall, it did not help)