KenKen, also known here as Mathdoku, mixes Latin-square logic with arithmetic cages. Rows and columns cannot repeat a number, while each cage must hit its target using the shown operation.
Unlike classic Sudoku, there are no 3x3 boxes. The cage maths becomes the extra structure, so the puzzle asks you to think about number combinations and placement at the same time.
Start with single-cell cages, then look for cages with only one likely combination. Multiplication and division cages often narrow down quickly because factor pairs are limited.
After each cage idea, check the row and column. A combination that works arithmetically can still be impossible if it repeats a digit in the wrong place.
KenKen has a different tempo from Sudoku. You bounce between arithmetic and placement, so one strong cage deduction can clear a whole row. It is a good mode for players who like logic with a mental-maths spark.