Difficult Kakuro Vol. 1 - 200 Challenging Puzzles Including Kakuro Variant TypesThis is not your average Kakuro book. Every puzzle here is designed to test experienced solvers - with larger grid sizes, fewer easy runs, and some truly devious combinations.The first 150 puzzles are standard Kakuro in various sizes (8x8 to 15x20). The final 50 puzzles are Kakuro variants: Odd/Even Kakuro - cells must contain only odd or only even digits Greater Than Kakuro - inequality signs between cells add an extra constraint Multiplication Kakuro - runs must multiply (not add) to the clue Division Kakuro - runs must divide to the clue What's Inside200 Kakuro puzzles, 6 x 9 inch format, thick paper, all solutions included.Bigger Grids. Harder Runs. Variant Types in the Final 50.By DJAPE - PhD in Computer Science, Washington Post puzzle contributor since 2006. Readers praise DJAPE's Kakuro as among the most satisfying and well-crafted available. A great gift for Kakuro fans who want real difficulty!