As the name suggests, Web Sudoku offers one thing: sudoku on the Web. You won't find fancy graphics, live chat rooms or any other distractions here. What you'll get is a sudoku lover's Utopia with thousands of games ranging from "easy" to "evil." A sudoku tutorial explains the number game to newbies, and power users can download a version of the site to play off-line. Your boss is going to hate us for introducing you to it. Have fun!
Anita Hamilton
Some are as useful as a GPS device, others aren't that useful but give you something to do when you had nothing planned for the day. Put them all together and they become TIME.com's 2008 picks for the best the Web has to offer