KenKen

The popular official KenKen game. For the 4x4, answers only consist of the numbers 1 to 4. For the 6x6 grid, answers can only be the digits 1 to 6, and so on. No digits can be repeated in any row or column. Solve each cage (outlined group of boxes) so that the digits equal the target number using the math operator supplied. For example a cage in a 4x4 grid with two cells that has the equation "1-" can be solved by either: 4, 3; 3, 4; 3, 2; or 2, 3.