Have you tried Kakuro?

"Do you Su Doku?"

That was the catchphrase last year when Su Doku became the latest national craze. There are plenty of Su Doku books you can buy and there are free puzzles available on the web.

Are you remember for a new challenge?

Try Kakuro, a combination crossword and number puzzle. Free puzzles can be found at:
http://www.divingforbananas.com/kakuro/

Give them a try. Warning: once you get the hang of them, they become highly addictive.