- op ▁for ▁two ▁players , ▁while ▁Kill zone ▁is ▁the ▁only ▁game ▁in ▁the ▁series ▁to ▁feature ▁off line ▁split - screen ▁multi player ▁in ▁the ▁Bot zone ▁mode ▁( B ot zone ▁allows ▁players ▁to ▁play ▁against ▁A I ▁b ots ▁and ▁is ▁present ▁in ▁each ▁install ment ). ▁Liber ation ▁features ▁an ▁online ▁co - op ▁campaign ▁as ▁well ▁as ▁a ▁multi player ▁mode ▁that ▁supports ▁up ▁to ▁ 6 ▁players ▁in ▁ad - h oc ▁and ▁up ▁to ▁ 8 ▁players ▁on ▁infrastr ucture . ▁Sh adow ▁Fall ▁features ▁an ▁online ▁co - op ▁surv ival ▁mode ▁for ▁up ▁to ▁ 4 ▁players ; ▁however , ▁it ▁can ▁only ▁be ▁accessed ▁by ▁purch asing ▁the ▁Season ▁Pass . ▁ ▁Games ▁ ▁Main ▁series ▁ ▁Kill zone ▁ ▁Kill zone ▁was ▁released ▁for ▁the ▁Play Station ▁ 2 ▁in ▁ 2 0 0 4 . ▁The ▁game ▁is ▁set ▁in ▁ 2 3 5 7 , ▁where ▁the ▁Hel gh ast ▁Empire ▁has ▁recovered ▁from ▁its ▁defeat ▁in ▁the ▁First ▁Ext ras olar ▁War ▁and ▁launched ▁a ▁bl itz krie g ▁against ▁the ▁outer ▁Inter plan et ary ▁Str ateg ic ▁Alliance ▁( IS A ) ▁col ony ▁planet ▁V ek ta . ▁V ek ta ' s ▁orb ital ▁Str ateg ic ▁Def ense ▁( S . D .) ▁platforms ▁failed ▁during ▁the ▁initial ▁assault , ▁allowing ▁the ▁Hel gh ast ▁to ▁land ▁sw ar ms ▁of ▁soldiers ▁onto ▁the ▁surface ▁and ▁making ▁it ▁difficult ▁for ▁the ▁out number