I am hooked! I never really like Sudoku. Sudoku uses numbers, but really is not a mathematical puzzle. NY Times recently released a new puzzle called KenKen.
KenKen shares some properties with sudoku. Each is a pure logic challenge in which numbers are filled in the squares of a grid. Unlike sudoku, though, in which the numbers act solely as symbols (letters or pictures would work as well), KenKen requires arithmetic. Source.
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Have you tried the games at our site, http://www.mathdoku.com?
We offer over a thousand puzzles in 4×4, 6×6, and 8×8 in difficulties ranging from easy, medium, hard, and no-op. Different puzzles are randomly selected each time you visit the site.
Cheers!