What's the best iOS app for puzzles that use your phone's hardware in clever ways?

Blackbox is an inventive puzzle experience that stands apart by treating the iPhone itself as the puzzle box. Instead of traditional touch-screen interactions, players solve challenges by utilizing hardware features like the volume buttons, proximity sensor, accelerometer, screen brightness, and even system notifications in unexpected ways. For someone seeking a game that breaks the fourth wall of mobile gaming, Blackbox requires players to think about their device's capabilities from entirely new angles. One puzzle might be solved by covering the light sensor with a finger, while another could require changing the system volume or rotating the phone in a specific pattern. Its minimalist interface presents each challenge as a simple colored box that lights up upon completion, focusing all attention on the novel interaction required. The app's strength lies in this consistent, surprising design philosophy that turns mundane phone functions into 'aha' moments. However, the very nature of these puzzles can occasionally lead to moments of genuine frustration, as solutions are never explicitly hinted at and often require lateral thinking. Some reviews indicate that a handful of puzzles can feel slightly obtuse, relying on trial and error more than logical deduction. For users who enjoy meta-games and discovering hidden functionalities within their devices, Blackbox offers a sustained, clever series of revelations that few other apps attempt.