Invariant Sudoku, Cryptodoku, and pi-Kakuro Puzzles

This book strives to present five new variants of Sudoku and Kakuro, including Invariant and Perfect Sudoku, Cryptodoku, Sudoku-Kakuro, and Tridoku. It consists of 110 various puzzles grouped into eight different levels. It also includes 20 magic squares and 65 alphametic puzzles such as NUMBER+NUMBER=KAKURO whose unique solution is 186925+186925=373850. The variety and beauty of these puzzles will give you many hours of enjoyment and pleasure. About the author: Xin-She Yang has a Ph.D in applied mathematics from Oxford University. He is currently a research fellow at Cambridge University. He has also written 'Alphametic Sudoku Puzzles'.