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- Site with puzzles playable online, tutorial, tips, etc.
Math Games, KenKen
- Puzzles playable online, sizes 3x3 to 9x9, as well as tutorials and tips.
- Many free puzzles playable online, in three sizes: 4x4, 6x6, and 8x8, in three difficulty levels. Also has "no-op" puzzles (where the operator clue is not given).
NekNek puzzles - Sudoku + Math
- Site with 1200 Calcudoku puzzles, sizes 4x4 to 9x9, solvable online.
Online Calcudoku Puzzles
- Daily Calcudoku (sizes 4x4 to 12x12) puzzles which can be solved for points.
- Online encyclopedia article about the game.
A New Puzzle Challenges Math Skills
- New York Times article by Will Shortz about the development of KenKen and how it is played. (February 09, 2009)
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