How to block y8.com

Hi,
I have set up the proxy in transparent mode, blocking using url filtering 'Games'.
I also have set up time based Proxy profiles that block access to internet.

Everything but y8.com is working as it is supposed to...!

All tested game-sites except y8.com is blocked.
Time based Proxy profiles block all tested web-traffic, except y8.com.

Any suggestions?

Thanks,

Mark