A European speaker mispronounces many vowel sounds, which can be confusing to children learning to spell. The letters often get stacked so the child cannot see some of them. And if the letter is moved to within an inch of its proper slot in the word, it is sucked into place as if by a magnetic force, depriving the child of her opportunity to correctly guess the order and placement of the letters. I think most parents will find the Montessori version of this app to be far superior.