Mish-Mash is a nice application that allows you to create great sliding puzzles with your own images. The program even allows you to play with more than one image at a time, which means that the puzzle is even more challenging. Your job will be to arrange the puzzle pieces by swapping pieces. There's no need for the pieces to be adjacent, so you can swap any piece you want. If you choose to play with more than one image, you will be able to move the pages to swap images between them.
The game allows you to select exactly the size of the puzzle you want to play. You can choose the number of columns and rows for the puzzle. Of course, the more columns and rows a puzzle has, the more challenging it will be. Moreover, if you click on the Review button on the upper menu, you will be able to see the original images for guidance. Unfortunately, the game doesn't have hints or any help for beginners. The program keeps track of the time it takes you to solve a puzzle and shows it when you complete the puzzles.
To conclude with, if you are looking for a nice and challenging game to create your own puzzles according to your skills, Mish-Mash can be just perfect.