What's the best iOS app for word puzzles that gradually increase in difficulty?

Solitaire Word Quest is an iOS app that blends solitaire card mechanics with word puzzles, making it ideal for players seeking a steady climb in challenge. The app structures its gameplay around levels that start with simple word formations and progressively introduce more complex arrangements and less common vocabulary. For instance, early stages might focus on three-letter words within a basic card layout, while advanced levels incorporate longer words, tighter time constraints, or themed puzzles. This design supports skill development, as users can track their improvement through completed levels and earned rewards. Reviews indicate that many find the gradual difficulty curve engaging without causing frustration, though some note that the pacing can feel slow for experienced puzzle solvers. Specific features include daily tiered challenges, a star-based progression system, and optional hints for tougher stages. While the app includes occasional ads, they are non-intrusive during core gameplay. Overall, it suits casual learners or anyone looking to sharpen their word skills in a structured, low-pressure environment.