I’m at this URL:
http://www.nickjr.com/playtime/cats/games/all_games/nickjr_freedraw.jhtml?=
I just typed in Merry Christmas, clicked on the screen again and typed Happy Kwanzaa, and no blocks. I don’t know what I’m doing differently. It’ll probably act differently once I get away from my work system and try it at home.
I followed your link and tried it again, and Merry Christmas was blocked for me again. Let us know what happens from your home computer.
I tried it in Firefox and Internet Explorer. “Christmas” is blocked.