The goal of Scrumble is to assemble an image from its composite parts. The trick: A tile can be moved horizontally only if at least one other tiles is left or right of it. Likewise, it can be moved vertically if at least one other tile is above or below it. This sounds easier as it is and is harder then one might think.
Try for yourself! The first ten levels are and will remain free, additional levels can be bought as an In App Purchase.