Almost everything about this collection is EXCELLENT. Spiral-bound for easy handling, great paper quality and great layout, not to mention there are 352 puzzles. But the one thing I find disturbing is that the puzzles are far too easy. I am not the sharpest knife in the drawer, but I am not the village idiot either. I've finished 10 of the puzzles, and have yet to be challenged. I thought that perhaps the further into the book you got, the more difficult the puzzles would be. Not so! All in all, a great publication, but when you fumble the ball on the ten yard line, you don't score!