netmeg - 2:25 pm on May 22, 2012 (gmt 0)
I dunno, I don't think the game would be appropriate everywhere.
I use a kind of plugin (Really Simple Captcha) that works with another plugin (Gravity Forms) that provides a random simple arithmetic problem - like 7+2=_ And I've never had a problem with spam entries. And people don't seem mind it.
As I get older, I have more and more trouble with deciphering traditional captcha images, and less and less patience. I dunno if it's because I'm older or they're getting harder to read. Probably both.