You should show what you have tried when asking for help (use the 'code' link below the reply box to post code and copy/paste any error messages you might be getting).
I want to make my game play a sound when the score reaches, ten, however, I have tried but have no clue how to do it. Help???
When you want to do something when some other condition is true, you use an 'if' statement:
if (condition) {
do_something;
}
You need to replace the 'condition' and 'do_something' with suitable code. You need to put the "if" statement in your act method, or in some method that your act method calls, so that it continuously checks the condition.