These puzzles are also known as paint-by-numbers or pic-a-pix. Whatever you call them, they're fun to solve. As you progress through a puzzle an image starts appearing and by the time you're finished a beautiful drawing is revealed. There are no trivial and too small puzzles in this book. Most of them range from 20x20 to 40x40 in size, which is optimal for solving and image quality. There are also a few bigger ones for those who like a tougher challenge.