It looks like sudoku, but it’s a true test of arithmetic rather than being a pattern puzzle. Each vertical and horizontal line has to contain the numbers 1-6 and the numbers can’t be repeated in any row or column.
The numbers in each heavily outlined set of squares, called cages, must produce the number in the top corner. For example, 9x means the numbers multiply to equal 9.
TIP: Numbers can be repeated in a cage, as long as they are not in the same line or row.