Thought of the day: Sudoku

Good afternoon/morning/evening (delete as appropriate haha)

So, it's Friday afternoon, the weather is crappy here in England and my 5 year old is happily making models out of his Lego.
I am making my way through the HUGE laundry pile (naughty mamma) so there isn't much for me to do while that's in the machine.

I have decided to dig out my bumper sudoku book, in an attempt to pass some time.
I love brain teasers, they really challenge me and definitely keep me occupied if I'm having a down day (more on that later)

So, have you heard of Sudoku? Do you enjoy them? Or do they annoy you?
I'd love to hear your thoughts!

If you've never tried them before, there are 9 squares each containing 9 boxes. Your task is to put the numbers in the correct square. Sounds simple enough?
But wait, there are rules!
Each box must contain 1-9 ONLY ONCE.
Each column must contain 1-9 ONLY ONCE.
and, you guessed it, each row must contain 1-9 ONLY ONCE!

Let me know YOUR thoughts on these puzzles!
Love them or loathe them?
If you haven't done one, go and attempt a few, your brain will thank you!