Numeric keyboard

Can you find a logical solution?
If you can, please help others by explaining it in the discussion below

Enter numbers in the squares so that each row, column and box contains all the numbers 1 to 9

To enter notes via the keyboard simply type more than one number or prefix with '0' to note one number. Number pad mode: click on 'notes'. Del or 0 will clear a cell.

Best of luck!