+1 to the above, as my work corporate firewall blanket blocks .xxx domains, and as an avid chess player and go fan I'd quite like to give this game a go. Obviously it can wait til I get home but it might suck for people who click through and get their names flagged by IT as having accessed a XXX domain.
In a pinch you can download the code from https://github.com/jes/isopath and load up public/index.html -- websockets won't work but everything else will.
I'm going to give it a go when I get home - my concern was more for anyone who absentmindedly clicks through to a .xxx at work and gets flagged.