The Perception puzzle book is available to purchase right now from Amazon.co.uk, Amazon.com and Amazon.eu. Please click the relevant link below to purchase this book via Amazon:
If you're based in Europe but outside the UK, then this book is also available on the version of Amazon in your country.
Sandwich Sudoku Rules
In our new series of videos, you can learn about new puzzle types and take part in quizzes. Why not have a watch?
A lovely sudoku variant, sandwich sudoku gives you hints around the edge of the grid as to the location of the 1 and 9 in each row and column. This video explains the rules so you can have a go at this fun but tricky variant...
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