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The Guardian - US
The Guardian - US
Science
Alex Bellos

Did you solve it? Sandwich sudoku - a new puzzle goes viral

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Earlier today I set you three sandwich sudoku puzzles. It’s a new variant of Sudoku that is getting lots of attention. To get a printable page of the problems click this link.

If you got stuck with the last one, which was very hard, this video reveals how to solve it.

Here are the final grids:

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I hope you enjoyed these puzzles. I’ll be back in two weeks.

I set a puzzle here every two weeks on a Monday. I’m always on the look-out for great puzzles. If you would like to suggest one, email me.

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