This third collection from The Telegraph has everything you have come to expect from Michael Mepham's puzzles - and more. 132 standard grids, graded according to difficulty, plus the ultimate test for hardened solvers: a sudoku in three dimensions...

 Stretch your mind...

 Solving Sudoku

 What is sudoku?

 The challenge

 About guessing

 Making a start

 The search for the lone number

 Twins

 Triplets

 Eliminate the extraneous

 Stepping up the sudoku action

 When all else fails

 Ariadne"s thread

 Solving a diabolical puzzle

 The last word

 Acknowledgements

Extreme Sudoku

The Puzzles

 Gentle

 Moderate

 Tough

 Diabolical

The Solutions

Sudoku Worksheets

Extreme Sudoku Solution