You can use my coding and sprites but please add me in the notes and credits section. There is slight gravity that increases downwards on the balls which makes them slower as they go upwards and faster as they go down. If you edit the project, you can change the sizes of the balls and the circle and it'll still work, as long as the circle is larger than the balls. You can even change the shape of the circle (though I'm not sure about the balls). At the top is the number of bounces they have made. Every time they bounce they change colour. Please follow, favourite or like. Btw you can drag the balls.
All code & art - @Samuel_Cui_12345 Around 1500 blocks of code.