<- Author of that thread.
The site is an interactive shell with progressively harder (but fun) coding challenges to complete. It's made to look like a *nix shell and has the basic commands built-in.
Also, there are a lot of rabbits.
Also, there are a lot of rabbits.
https://history.google.com/history
Also, it is possible that the url once you actually enter is different and that may be sufficient to get in.
Thanks!