폴리볼 (PolyBall) is a free Android application designed for sports enthusiasts who enjoy making predictions about KBO baseball games. Users can participate in various predictions regarding match outcomes and player events, such as home runs and stolen bases. The app rewards successful predictions with entry tickets, enhancing the excitement of following the games. By predicting daily match results, users accumulate more entry tickets, increasing their chances of winning prizes.

The app streamlines participation by allowing users to log in with their Kakao account. After predicting the day's game outcomes, they can use their accumulated tickets to enter contests for KBO game tickets. Although optional notifications can be enabled to receive important alerts about predictions and results, the app does not require mandatory access permissions, ensuring a smooth user experience. 폴리볼 offers fans an interactive way to engage with baseball and enjoy the thrill of competition.