Well, Google does not explain what their search is for; why should you have to? Considering it is a niche market for folks that want to solve crossword puzzles, and you had enough people talk about it with each other, you could keep the front page non-descriptive. It is a destination site that people will visit when they know about what it does.

I wouldn't want to see a slogan every time I visited the site, anyways.

Change the tip word daily to mix it up a bit.