Torodial Sudoku Instructions

Rules: The challenge is to fill in the numbers 1 to n in the grid, subject to the following rules:

1. There are the numbers 1 to n in each row and column.
2. Each area of size n also has the numbers 1 to n.
3. Areas may also exit one side of the grid and enter via the other side, these areas must still contain the numbers 1 to n.