A bit more challenging latin squares:
[5×5]
[6×6]
[7×7]
[8×8]
[9×9]
[10×10]
Latin square is sudoku without the small (3×3) areas.
Instructions:
Complete the N×N grids with digits 1–N so that there are no repeated digits on any row or column.
You can solve online, although the interface is very primitive and does not give any feedback or check the answer. Click on an empty square and type a number.



