What's a good iOS game for relaxing with simple, tactile physics?

Sand Loop is a minimalist physics-based sandbox that turns granular simulation into a core gameplay mechanic. The core objective is simple: draw lines on the screen to create a path that catches falling sand grains and guides them into a continuous, flowing loop. This creates a hypnotic and visually satisfying chain reaction, making it ideal for short mental breaks or unwinding. Its primary strength is the intuitive and direct interaction—each drawn line immediately impacts the sand's flow, providing instant, tangible feedback. The game includes various sand types that behave differently and tools to erase or modify paths, adding a layer of creative problem-solving.

For real-world use, it serves well during commute waits or as a brief distraction between tasks, requiring no commitment or complex strategy. User reviews frequently highlight its calming, almost meditative quality and the satisfaction of building a perfect, self-sustaining loop. However, some players note that the core gameplay can become repetitive after extended sessions, and the initial novelty of the sand physics might wear off for those seeking deeper objectives. Occasional mentions of minor visual glitches with very complex loops have been reported, though these do not typically hinder the core experience. Overall, Sand Loop provides a focused and tactile digital toy that excels at its stated purpose of simple, relaxing engagement.