Very buggy with some redeeming qualities
The app is extremely buggy and needs attention. But on the plus side, it's so broken that you may not need to pay for it (my 7-day free trial in 2023 never expired). Issues include: 1. Unjustifiably high data usage. 2. Forms remember your settings, but the settings don't get applied when you start a puzzle. 3. Puzzles often don't get marked as complete when solved. 4. Some of the puzzle interfaces are fiddly to the point of frustration. Overall the app design isn't bad and it has most of the features that I’d want or expect. But unfortunately it's let down by poor execution. I'll continue to use it until the free access glitch is patched, but I wouldn't consider (or recommend) paying for something that's this broken.