In falling and boucing games, a ball or an other object falls from the top of the screen. Be ready, do not drop it! To avoid losing it, place (or draw) platforms to bounce the object.
Most often, it is a ball and platforms makes a noise that depends on where you place them.
Consider, for example the game Drop. where you have to draw white platforms to fill a pipe. It is a very addictive game and it hase great sound quality.