I'm trying to make a bouncing ball game, but when certain score or time passed(don't know yet which one to choose), the ball has to fall/bounce faster so the difficulty is even harder. Please Help!
Add an action and change the character speed , bounce force etc under gameplay properties. Once your ball collects that action object/shape the gameplay properties will change to what you have set. You can make the action transparent if you don't want to show the action image to the player by setting opacity to 0.
Or you could play around and change time wrap in gameplay properties , that will also have a similar affect that you want.