Join the fun and practice math with our app! Perfect for children just starting to learn addition and subtraction. We've designed it to be fast-paced and engaging. === How to play === 1. Choose from three modes: addition, subtraction, and mixed. 2. Each mode has 16 levels, starting with easy problems and gradually getting more difficult. 3. After a problem is displayed, a heart mark will fall from the top. Tap it to start a hint animation. * Note: The "hint" button is available in the ad