The Times Ultimate Su Doku - Wayne Gould

The ultimate treat for the Su Doku fan, a new collection of 150 puzzles.The ultimate treat for Su Doku fans : a new collection of 150 unpublished puzzles of all levels.10 6x6 grids, beginning at Easy20 Easy puzzles30 Mild puzzles40 Difficult puzzles30 Fiendish puzzles10 Ultra Fiendish puzzles10 16x16 grids, beginning at EasySu Doku is a number grid consisting of 9 large squares each divided into 9 smaller squares.Between 3 and 4 numbers are already provided in each of the smaller squares.The point is to fill the grid so that every column,every row and every 3x3 box contains the digits 1 to 9.