I just discovered a cool new Sudoku-like game called KenKen.

A KenKen board is an nxn grid, and the object is to place the numbers 1 to n in each square subject to the following rules.

1. Do not repeat a number in any row or column.
2. The numbers in each heavily outlined set of squares, called cages, must combine (in any order) to produce the target number in the top corner of the cage using the mathematical operation indicated.
3. Cages with just one box can be filled in with the target number.
4. A number can be repeated within a cage as long as it is not in the same row or column

Here is a completed board:

If you would like to try your hand at these puzzles go to the website KenKen.com or to the New York Times, which is featuring six new KenKen puzzles each day.