INDIAN SUDOKU is the fourth book by the author.<br>Other books are:<br>1. Sudoku Is Fun<br>2. Diamond Easy Sudoku<br>3. Advanced Sudoku<br>Each book contains 100 Sudoku Puzzles. Each and every puzzle is self-generated.<br>A Sudoku with only 18 clues is a world record and the author has nicknamed it as 'Sudoku in Bikini'.