KenKen

From BoardGameGeek:

KenKen puzzle put into a multyplayer format. Do not repeat a number in any row or column. 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. Cages with just one box should be filled in with the target number in the top corner. A number can be repeated within a cage as long as it is not in the same row or column.