This is not just another book of Kakuro or Cross Sums puzzles. This is a book of BIG and DIFFICULT Kakuros, which will definitely test your solving skills There are 200 "crosswords with numbers" in here. The first 150 puzzles are your standard, but difficult, Kakuros in different sizes, from small 8x8 to some really big ones such as 18x18 or 15x20. The final 50 puzzles are Kakuro variants, including consecutive Kakuro, non-consecutive Kakuro, odd-even Kakuro, greater-less Kakuro and last but not least, Kenkuro Half of the puzzles are labeled HARD and the rest are MEDIUM, with a very few EASY ones, which are there just to warm you up. So, get ready for a serious challenge which will provide hours and hours of fun ENJOY