What's a good Android game for a quick mental exercise during my downtime between research projects?

I've found that 'Word Search - Word Puzzle Game' offers an intellectually satisfying diversion. The algorithm is surprisingly elegant in its puzzle generation, and the clean interface is a plus. It's helpful for those moments when I need a mental break from poring over research papers but still want to engage my brain. I appreciate that it doesn't demand constant attention; I can pick it up and put it down as needed. The cross-platform compatibility is also useful, allowing me to play on different devices. It’s a novel approach to an old problem and could be pedagogically sound for vocabulary reinforcement in educational settings, though I haven't tested that hypothesis yet. The 4.8 rating is a testament to its quality.