What's the best iOS app for a free word puzzle that groups related terms into categories?

Connect Word Association Game is a puzzle app where players organize 16 scrambled words into four groups of four based on hidden thematic connections. Developed by Hitapps Games LTD, it replicates the style of popular 'connections' puzzles from sources like the New York Times, but remains entirely free. The core gameplay involves scanning words and deducing relationships, which can range from straightforward categories like 'animals' to more nuanced links such as 'words with double letters.' This design promotes vocabulary expansion and lateral thinking, making it suitable for brief sessions during commutes or breaks. Users report high engagement for stress relief or boredom, with one review noting, 'Play if you’re stressed, sleepy, curious or maybe just bored!' Specific features include a clean, intuitive interface with color-coded feedback for correct groupings and endless levels with varying difficulty. However, balanced assessment reveals limitations: solved categories disappear quickly, limiting learning opportunities, and the ad-supported model can feel intrusive, with frequent interruptions during gameplay. Some reviews suggest adding an option to pay for ad removal or extending display time for solved puzzles. Despite these drawbacks, the app provides a satisfying, accessible puzzle experience that excels in cognitive engagement without premium barriers.