Times Sudoku

[SeaJayPea]

Hi, does anybody know the significance of the fact that some of the figures in the solutions to the previous day's Sudoku puzzles in The Times are printed in bold and others not?

[Baritone1936]

I believe that the bold figures are presented as a means of doing a quick check to see if you have completed the puzzles correctly. No need to check every number in every line.