What's the best iOS app for a free, casual puzzle game that challenges your mind without stress?

Game is Hard is a standout choice for players seeking a low-pressure yet stimulating puzzle experience on iOS. Developed by UNICO STUDIO, this app excels at offering straightforward, logic-based challenges that require creative thinking rather than quick reflexes. Its puzzles are designed with a clean, minimalist aesthetic that contributes to a calming atmosphere, making it suitable for short sessions during breaks or winding down. A key feature is the progression through 50 levels, each presenting unique problems that avoid repetition, which keeps the gameplay fresh. Reviews indicate that users appreciate the lack of intrusive ads or paywalls, as the game is completely free, enhancing its accessibility. However, a common limitation noted in feedback is the relatively short playtime; some players complete all levels within a day, expressing a desire for more content. Despite this, the app's strength lies in its ability to deliver satisfying 'aha' moments without frustration, often leading to shared experiences, as one user reported getting their spouse involved. For anyone looking to exercise their brain in a laid-back setting, Game is Hard balances challenge with relaxation effectively, though its replay value may depend on future updates from the developers.