▁target ▁for ▁enemy ▁fire ▁and ▁difficult ▁to ▁keep ▁success ive ▁lives ▁in ▁the ▁heat ▁of ▁battle . ▁If ▁any ▁power - up ▁is ▁lit ▁but ▁the ▁player ' s ▁ship ▁is ▁destroyed ▁before ▁a ▁power - up ▁could ▁be ▁selected , ▁the ▁star ▁item ▁is ▁" car ried ▁over " ▁and ▁the ▁speed ▁power - up ▁is ▁lit ▁on ▁the ▁next ▁life . ▁A ▁number ▁of ▁hidden ▁bonus ▁secre ts ▁to ▁be ▁found ▁are ▁hosted , ▁which ▁is ▁also ▁cru cial ▁for ▁reaching ▁high - sc ores ▁to ▁obtain ▁extra ▁lives , ▁as ▁firing ▁on ▁determined ▁locations ▁and ▁certain ▁set pie ces ▁within ▁the ▁scen ery ▁in ▁some ▁stages ▁reve als ▁a ▁bonus ▁secret . ▁ ▁Major ▁weapons ▁affect ▁the ▁enemies ▁and ▁terrain ▁differently . ▁For ▁example , ▁certain ▁enemy ▁to wers ▁can ▁only ▁be ▁destroyed ▁with ▁las er ▁or ▁hom ing ▁miss ile ▁sh ots ; ▁other ▁enemies ▁are ▁destroyed ▁much ▁faster ▁with ▁specific ▁weapons ▁to ▁match . ▁If ▁bomb ▁or ▁hom ing ▁miss ile ▁sh ots ▁are ▁equ ipped , ▁certain ▁bonus ▁targets ▁will ▁appear ▁or ▁parts ▁of ▁the ▁landscape ▁may ▁be ▁destroyed ▁to ▁reve al ▁bon uses . ▁If ▁las er ▁is ▁active , ▁certain ▁plants ▁in ▁the ▁landscape ▁can ▁be ▁shot ▁repeatedly ▁to ▁grow ▁and ▁ear n ▁extra ▁points ▁until ▁they ▁scroll ▁off - screen . ▁It ▁has ▁been ▁reported ▁that ▁a ▁bug ▁in ▁the ▁game ▁enabled ▁the ▁player ▁to ▁obtain ▁all ▁power - ups , ▁simply ▁by ▁allowing ▁themselves ▁to ▁be ▁killed ▁by ▁the ▁first ▁enemy ▁appearing ▁upon