TY  - BOOK
TI  - Brain training puzzles : Difficult, Book 2
SN  - 9781847321954
U1  - 793 21
CY  - London : Carlton, ©2008
KW  - Mental discipline
KW  - Mental efficiency
KW  - Puzzles
N1  - This allows you to plot your progress and see how well you are developing.Difficult 1 and 2 contain a high concentration of tough puzzle-types - stimulating and very useful for development - like Killer Sudoku, More Than Sudoku, Trios, Kakuro, Lateral Thinking, and Yudoku
ER  -