This is one of the best books of paint-by-number logic puzzles (also known as Nonograms, O'Ekaki, Hanjie, Griddlers, Paint-doku, Paint-A-Pix, CrossPix and numerous other names) I've run across...and I've tried quite a few. These are multi-color puzzles, which helps this book to stand out from the crowd. The puzzles represent a range of difficulties, but none are idiotically simple and none are impossible. The pictures are all nice, and some of them are gorgeous. For new solvers, there is a reasonable how-to introduction. The paper is high-quality and the wire binding makes it easy to use -- it lies perfectly flat. The only reason I can't give it 10 stars has to do with the color spectrum chosen, which in several ways is simply too broad. Few solvers will have a full range of writing implements in all the colors called for. Worse, some of the puzzles use up to four shades of the same basic color (i.e. pale, light, medium and dark), and there is enough variation in the printing process that it is hard to match up the colors in a few of the four-, five-, and six-or-more-color puzzles. Still, it is overall a terrific puzzle book and I look forward to more from these authors.