Some of my readers are puzzle enthusiasts, correct? You should register for the 2009 US Google Puzzle Championship. The championship occurs on Saturday, June 20, from 1:00-3:30 PM EDT. You must register before this Thursday, June 18.
You take the test from home. You just print out all the puzzles, solve them on paper, and then submit your answers online. Typical puzzles include Sudoku, Arrow ring, Battleships, and all sorts of other "grid" puzzles. But there's also a "spot the difference" puzzle every year. You can look at last year's test to get a better idea.
My tips: Try the practice test first. Use colored pencils. Don't expect to win. I never get close. Do it just for fun.
Tell us if you're participating!