The Games: Puzzles: Brain Teasers: Mathematical: (KenKen Mathematical )

Websites and pages related to the mathematical puzzle KenKen or Kendoku. KenKen Mathematical Brain Teasers Puzzles Games.

KenKen and KenDoku are trademarked names for a style of arithmetic and logic puzzle invented in 2004 by Japanese math teacher Tetsuya Miyamoto, who intended the puzzles to be an instruction-free method of training the brain. (wikipedia)