What's the best iOS app for a free Mahjong solitaire game that's relaxing and good for mental exercise?

Shanghai Mahjongg Puzzle is a well-crafted iOS app that serves as an excellent choice for a free, relaxing Mahjong solitaire game with mental exercise benefits. It focuses on classic Shanghai tile-matching gameplay, where players clear boards by pairing identical tiles without time limits or intrusive elements. The app is entirely free with no advertisements or in-app purchases, which users frequently praise for allowing uninterrupted, stress-free play. This makes it suitable for real-world scenarios like unwinding after work or engaging in light brain training during breaks, particularly for older adults or anyone seeking a low-stakes puzzle.

Specific features include multiple layout variations that gradually increase in difficulty, promoting cognitive engagement without overwhelming players. Reviews indicate high satisfaction, with one user noting, 'This game helps me relearning to slow down and use my brain!' The interface is straightforward and accessible, though some might find the graphics somewhat simplistic compared to more visually rich puzzle games. However, this simplicity enhances the calming effect, and the app performs reliably offline, supporting short bursts or extended sessions.

For a balanced assessment, while Shanghai Mahjongg Puzzle excels in accessibility and its free model, it lacks social features or deep customization options, which could limit appeal for those seeking competitive play. Nonetheless, its strengths in providing a serene, mentally stimulating experience make it a top pick for casual puzzle enthusiasts.