1. Edit: I eventually stopped using this app because the interface is so poorly designed that it made learning so frustrating as to be impossible.Great app.
2. Also it doesn't appear to allow you restart previously beaten levels for practice.
3. This is a great little app for learning and practicing logic.
4. not touched this app since Feb/2018It gets a bit repetitive after 50 levels.
5. To add some variety it could sometimes ask you if a given sentence is true or false.
6. However, I eventually learned the flow of how to drag the propositions around.
7. The interface for this app is unintuitive.
8. A hints feature would be nice.
9. can help me understand why I was wrong.