Surface Bounce Laboratory is a premium sports quiz built around bounce, friction, trajectory, surfaces, spin, adaptation. Train with a polished Material UI and a local Room question database seeded on first launch.

Quiz modes: Surface Study. Bounce Flash — 8s timer. Material Chain — memory reveal. Adaptive Court — category swap every 3. Session modifiers include No Bounce Hint, Hidden Surface, Arc Chain, Lab Boost. Hint types: Bounce Preview, Surface Property, Speed Compare, each with distinct scoring penalties and star rules.

The Trajectory Band Round adds bonus scoring and reward progress when you chain correct answers. Track Lab Rating, streaks, accuracy, timer bonuses, hint penalties, stars, coins, and rank titles after every session.