An easy-to-use app, so even inexperienced smartphones and tablet owners. Depending on the exercise, 3 levels of difficulty. The right or wrong solution will soon pop up, saves the erase. If you do not finished the crossword puzzle, this is indicated by means of a button on the overview, you can enter at any time again. A solution help there also. You can delete the whole puzzle and catching again. Well suited for doctor visits and Bedridden! For the money, seen in, relative to the magazine, highly recommended. No advertising.