▁left ▁and ▁right , ▁while ▁its ▁main ▁weapon , ▁a ▁tur ret ▁gun , ▁can ▁be ▁aim ed ▁in ▁a ▁ 1 8 0 ▁degree ▁span ▁and ▁n uk es ▁which ▁can ▁destroy ▁enemies ▁off ▁the ▁screen . ▁The ▁game ' s ▁story line ▁de als ▁with ▁a ▁Red ▁Star ▁( S ov iet ▁Union ) ▁invasion , ▁and ▁the ▁player ▁takes ▁the ▁role ▁of ▁the ▁commander ▁of ▁an ▁At omic ▁T ank ▁to ▁rep el ▁the ▁invasion ▁back ▁into ▁the ▁main ▁headquarters ▁of ▁Red ▁Star . ▁The ▁main ▁prem ise ▁of ▁the ▁game ▁is ▁one ▁individual ▁against ▁the ▁collect ive ▁forces ▁of ▁Commun ism ▁led ▁by ▁Joseph ▁St alin . ▁ ▁The ▁game ▁features ▁a ▁total ▁of ▁ 1 9 ▁levels / m issions ▁along ▁with ▁two ▁game ▁modes ▁( mission ▁and ▁surv ival ). ▁In ▁mission ▁mode , ▁one ▁must ▁bl ast ▁through ▁count less ▁enemies ▁and ▁defeat ▁a ▁b oss ▁at ▁the ▁end . ▁Mission ▁mode ▁allows ▁for ▁three ▁lives ▁in ▁each ▁mission . ▁Upon ▁defe ating ▁the ▁b oss , ▁the ▁player ▁vis its ▁the ▁arm ory , ▁where ▁one ▁can ▁get ▁various ▁up gr ades ▁and ▁power - ups ▁for ▁use ▁in ▁subsequent ▁miss ions . ▁After ▁going ▁through ▁the ▁first ▁nine ▁b oss es , ▁the ▁player ▁must ▁destroy ▁the ▁same ▁nine ▁b oss es ▁in ▁the ▁remaining ▁nine ▁levels , ▁until ▁the ▁final ▁level . ▁The ▁new ▁b oss es ▁are ▁slightly ▁different ▁in ▁weapons ▁and ▁arm or . ▁ ▁In ▁the ▁PC ▁version ▁of ▁the