The Japenese officially have a monopoly on square-shaped number-themed logical puzzles.The New York Times today began including 'Kenkens' in their Arts section, along with a crossword puzzle and the bridge section.
The rules are simple enough (as Sudoku). As in above, if the square is 6x6, one is allowed to use the digits 1-6 only once each in a row and column (as Sudoku). However, the numbers must satisfy the operations denoted within the bolded areas.
The 4x4 was very easy. The 6x6, not so much.
Here's a link:
http://www.kenken.com/
For online games, visit http://www.webkendoku.com where there are over 1000 random games in 4x4, 6x6, and 8x8 tables and difficulties like easy, medium, hard, and no-op.
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