For the true lovers of Jigsaw Puzzles we have created the Hidden Puzzles category.
The preview of most puzzles in Hidden packs is hidden as in monthly packs.
In order to solve hidden puzzles, you need to complete already opened puzzles first.
Upon completion of all hidden puzzles in the pack, you will be able to complete the Bonus puzzle. There are 14 packs in this category so far but we plan to add more in the future.