8 Really Fun Paper and Pencil Math Games...you will not even realize that you’re doing math with these games because they are so much fun, and each has a great replay value.

Enchanted Mind Brainbender Puzzles (3  - 12)

Enchanted Mind - Interactive Puzzles (3  - 12)

FUN WITH MATH - Math Humor, Jokes and Mathematical Games and Recreations on the Internet
Math Puzzle - Variety of math puzzles.
Nick’s Mathematical Puzzles - The puzzles presented here "range over geometry, probability, number theory, algebra, calculus, and logic. All require a certain ingenuity, but usually only pre-college math... Explaining how an answer is arrived at is more important than the answer
Online Math Games - Free math games and worksheets for kids
The Maths File Game Show - makes mathematics fun and accessible

Recreational Mathematics...Cryptograms...Dissection...Folding...Games ... Illusions ... Interactive Entries...Magic Figures... Mathematical Art...etc.