What's the best Android app for quick reflex training with geometric puzzles?

Triangles (game) is a casual arcade title that excels at sharpening reflexes through geometric challenges. Players navigate triangular shapes by tapping the screen to avoid barriers and collect points, with levels that gradually increase in speed and complexity. This setup makes it ideal for short bursts of play, such as during commutes or breaks, where users can test and improve their reaction times. Key features include intuitive one-tap controls, a minimalist visual style that reduces distractions, and a scoring system that encourages repeat attempts for higher ranks. Reviews indicate that many find the game addictive due to its straightforward mechanics and immediate feedback, which helps build consistency in hand-eye coordination. However, some users note that the ad-supported model can interrupt flow, and the gameplay may feel repetitive over extended periods. Despite this, the app's design supports consistent practice without a steep learning curve, making it a reliable tool for casual reflex training.