▁( SI E ) ▁video ▁game ▁cons oles . ▁The ▁main ▁series ▁and ▁the ▁Play Station ▁Port able ▁( P SP ) ▁install ment ▁were ▁developed ▁by ▁Gu err illa ▁Games , ▁a ▁subs idi ary ▁of ▁S IE , ▁and ▁the ▁Play Station ▁V ita ▁install ment ▁was ▁developed ▁by ▁Gu err illa ▁Cambridge . ▁Kill zone ▁consists ▁of ▁six ▁games , ▁beginning ▁on ▁the ▁Play Station ▁ 2 ▁in ▁November ▁ 2 0 0 4 ▁with ▁Kill zone , ▁and ▁continued ▁on ▁the ▁Play Station ▁Port able ▁in ▁October ▁ 2 0 0 6 ▁with ▁Kill zone : ▁Liber ation . ▁Kill zone ▁ 2 ▁was ▁released ▁for ▁the ▁Play Station ▁ 3 ▁in ▁February ▁ 2 0 0 9 , ▁and ▁Kill zone ▁ 3 ▁was ▁released ▁in ▁February ▁ 2 0 1 1 , ▁also ▁for ▁the ▁Play Station ▁ 3 . ▁Kill zone : ▁Mer cen ary ▁was ▁released ▁for ▁the ▁Play Station ▁V ita ▁in ▁September ▁ 2 0 1 3 , ▁followed ▁by ▁Kill zone ▁Sh adow ▁Fall , ▁a ▁launch ▁title ▁for ▁the ▁Play Station ▁ 4 , ▁in ▁November ▁ 2 0 1 3 . ▁ ▁Plot ▁syn opsis ▁The ▁series ▁is ▁set ▁in ▁the ▁ 2 4 th ▁century , ▁showing ▁the ▁gal actic ▁war ▁between ▁the ▁Inter plan et ary ▁Str ateg ic ▁Alliance ▁( IS A ) ▁and ▁the ▁Hel ghan ▁Empire . ▁The ▁Kill zone ▁series ▁follows ▁the ▁continuous ▁war ▁between ▁the ▁I SA ▁and ▁Hel gh ast ▁taking ▁place