This is the original source. The books, such as Coloriages mystères Disney - Princesses , typically feature 100 to 128 pages of mystery grids.
(coloriage mystère) pages that have been "fixed" for better printing or resolution coloriages mysteres disney princesses pdf fixed hot
Unlike standard coloring books, mystery coloring uses a numbered grid (similar to paint-by-numbers but with colored pencils or markers). You don’t know the final image until the very end. Each symbol corresponds to a hue, and as you fill in the tiny cells, a Disney Princess—Cinderella, Belle, Tiana, or Rapunzel—slowly emerges from the chaos. This is the original source
Here are some popular Disney Princess coloring books available in PDF format: a Disney Princess—Cinderella