Sudoku Variations (Volume 4)
Super Sharp Cutting-Edge Sudoku: Three Sudoku Variants to Hone Your Brain (Volume 2)
The Kakuro Challenge: Easy, Standard, Hard, Extreme Kakuro Puzzles
Third-Degree Green Belt Kakuro (Martial Arts Puzzles Series)
The Massive Book of Kakuro: 1000 Puzzles (Volume 1)
Difficult Kakuro: 200 puzzles (Volume 2)
Giant Kakuro Volume 2: 100 20x20 puzzles & solutions - now even harder!
Consecutive Sudoku Compendium
Sudoku Variations (Volume 3)