This book introduces two new variants of number puzzles: Cryptic Kakuro and Cross Sums Sudoku. Cryptic Kakuro puzzles combine the standard Kakuro puzzles with alphametics, while Cross Sums Sudoku puzzles are a genuine combination of both Kakuro and Sudoku with pleasing symmetry and simplicity. This book includes 100 puzzles for your enjoyment. 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. Other books by Xin-She Yang: Alphametic Sudoku Puzzles Invariant Sudoku, Cryptoduku & pi-Kakuro Puzzles