Sudoku

problem

Diagonal Product Sudoku

Age

11 to 16

Challenge level

1 out of 3

Given the products of diagonally opposite cells - can you complete this Sudoku?
problem

Star Product Sudoku

Age

11 to 16

Challenge level

2 out of 3

The puzzle can be solved by finding the values of the unknown digits (all indicated by asterisks) in the squares of the $9\times9$ grid.
problem

All-Variables Sudoku

Age

11 to 18

Challenge level

1 out of 3

The challenge is to find the values of the variables if you are to solve this Sudoku.