Sometimes you just can't beat an old-fashioned pencil.....

Conceptis - Few websites do free online/printable number/picture pizzles as well as Conceptis. Try your hand at weekly sudoku puzzles, or get fancy with kakuro, battleships, slitherlink, hashi, and half a dozen varieties of picture-forming puzzles. Some can be played online and all can be printed and solved with a good old fashioned pencil.

Found at Jay is Games, (er....I find a lot of stuff here!!)