dᵻstɹˈʌkʃən əvə hˈoʊl ɐtˈæk wˈeɪv ɹɪzˈʌlts ɪn bˈoʊnəs pˈɔɪnts, ænd dᵻstɹˈʌkʃən ʌv spəsˈɪfɪk ɡɹˈaʊnd tˈɑːɹɡɪts sˈʌtʃ ɐz bˈɪldɪŋz mˈɑːɹkt wɪð ˈɛks ɹɪzˈʌlts ɪn bˈoʊnəs pˈɔɪnts ænd ɐn əkˈeɪʒənəl ˈɛkstɹə lˈaɪf æt ðɪ ˈɛnd ʌv ˈiːtʃ lˈɛvəl.
Destruction of a whole attack wave results in bonus points, and destruction of specific ground targets (such as buildings marked with X) results in bonus points (and an occasional extra life) at the end of each level.