FRANCO The application works well and does what it is said to do. However, as an Italian user, I feel the lack of an important feature, which is very common in latin languages countries which use many, many polisyllabic words, as at least in mine: the capability to "block" the "black" cells in the desired positions prior to start building the puzzle, so obliging its construction around them. Many puzzles in my country are developed with a symmetrical placement of black cells which are in quantity much less than the open (letters) ones. If the developer is interested, I could e-mail them pictures of some of those typical puzzles.
I hope this can be implemented in some future version. Because of that I've dropped down one star.
(Version 5.1.7)