neoncube
It's actually quite simple - if you click/tap the hint-button (refering to Android here), the app will simply delete all faulty text that you might have entered and add the next correct letter.
A couple of years back, this function was linked to a score system (don't recall exactly how it worked), i. e. you only had a limited amount of hints to use. With a correct answer the count was incremented I believe, but it could have had a more sophisticated mechanism.
I for one love the hints - I hate having to enter long text. The hints allow me to just repeatedly tap the hints button to avoid that where I wasn't able to copy'n'paste an answer due to the learning mechanism.
