What's the best iOS app for a word puzzle that helps reduce stress while keeping the mind engaged?

Serene Word Search is a word puzzle app that excels at combining mental stimulation with stress relief. Designed for users seeking a peaceful escape, it features grids filled with positive, uplifting words set against serene backgrounds. The app includes adjustable difficulty levels and a library of puzzles themed around concepts like nature and wellness, making it suitable for short breaks or longer unwinding sessions. Background music and sound effects are carefully curated to enhance relaxation, with options to customize audio settings. Reviews indicate that many users find it effective for reducing anxiety, with one noting it 'calms the mind' during busy days. For real-world use, it serves well during commutes, before bedtime, or in waiting rooms where a low-stakes activity can ease tension. However, some puzzle enthusiasts might find the challenges less complex compared to competitive word games, and the free version includes occasional ads. Despite this, its focus on simplicity and mindfulness makes it a standout choice for those prioritizing mental well-being over high scores.