What's the best iOS app for a word puzzle game that starts easy and ramps up to tough challenges with reward incentives?

Word Trip is a word puzzle game for iOS that excels at providing a scalable challenge paired with motivational rewards. The app presents players with letter grids where they must form words to complete levels, starting with straightforward puzzles to build confidence before introducing increasingly complex combinations. This design makes it suitable for both casual players and those seeking a more rigorous mental workout. A key feature is the in-game reward system, which allows users to accumulate points and unlock bonuses through consistent play, adding a layer of progression beyond mere puzzle-solving. Reviews indicate that users appreciate this balance, with one noting, 'I especially like that the spelling words are easy then I’m challenged with the hard.' However, the experience isn't without flaws. Some users report persistent ads even in the purported ad-free version, which can interrupt gameplay. Additionally, long-time players have mentioned a lack of special events in recent updates, reducing variety. Despite these issues, the app's core mechanics—such as daily puzzles and a hint system for stuck moments—keep it a popular choice. For anyone looking to stretch their vocabulary gradually while earning small incentives, Word Trip offers a reliable, if occasionally ad-intrusive, option.