What's a good Android app for quick, mentally engaging word games to pass time in a waiting room?

Word Tour is a strong candidate for killing time during short waits. The app's core gameplay involves finding words in a grid connected to a specific theme, a task that requires concentration but is designed for relatively quick completion. Its primary strength for this use case is the pace; levels are snappy and don't bog users down with lengthy animations or complex side mechanics. The hint system, which can reveal letters, provides a way to bypass momentary mental blocks without ruining the challenge. This makes it suitable for environments where attention might be frequently interrupted. However, the ad-supported model means users might encounter video ads between levels, which can slightly disrupt the flow. Reviews indicate the game successfully avoids 'cutesy' clutter, keeping the focus purely on the puzzle. The daily challenges also offer a reason for repeated short sessions, building a habit without demanding a major time investment. For a few minutes of cognitive engagement in a doctor's office or queue, Word Tour delivers a focused and satisfying experience.