What's the best Android app for color-based sorting puzzles that are relaxing and don't have time limits?

Ball Sort Puzzle is a well-regarded choice for users seeking a calming, logic-based puzzle experience on Android. The app centers on sorting colored balls into tubes until each tube contains balls of a single color, requiring strategic planning and patience. Its lack of time pressure makes it suitable for real-world scenarios like waiting in line or winding down before bed, where users can engage at their own pace. Specific features include hundreds of levels with progressively increasing difficulty, smooth drag-and-drop controls, and a clean interface that minimizes distractions. Reviews indicate that many players appreciate the mental stimulation it provides, comparing it to a digital version of traditional sorting games. However, some users note that the ad-supported model can occasionally interrupt gameplay, though ads are typically skippable or placed between levels. The app's gradual learning curve helps build problem-solving skills without frustration, and its simple mechanics ensure accessibility for all ages. While the repetitive nature of sorting might not appeal to everyone, its consistent challenge and satisfying completion moments keep users engaged. Overall, Ball Sort Puzzle balances relaxation with cognitive exercise, making it a solid option for casual puzzle enthusiasts.