▁For ▁this , ▁he ▁util izes ▁un ar med ▁hand - to - hand ▁combat , ▁clubs , ▁kn ives ▁and ▁fire ar ms . ▁Items , ▁such ▁as ▁weapons , ▁may ▁be ▁collected ▁in ▁the ▁invent ory ▁for ▁later ▁use . ▁There ▁are ▁three ▁different ▁modes ▁by ▁which ▁to ▁explore ▁any ▁given ▁level : ▁Normal ▁( non - vi ol ent ▁travers al ), ▁Athlet ic ▁( vi ol ent ▁conflict ) ▁and ▁Ste alth ▁( cover t ▁action ). ▁The ▁game ▁also ▁features ▁puzz le ▁solving , ▁like ▁searching ▁down ▁a ▁key ▁card ▁to ▁un lock ▁the ▁next ▁level . ▁The ▁player ' s ▁pro gression ▁can ▁only ▁be ▁saved ▁with ▁the ▁completion ▁of ▁each ▁level . ▁ ▁Syn opsis ▁After ▁dr ifting ▁in ▁space ▁for ▁centuries , ▁astr onaut ▁U ly ss es ▁and ▁his ▁crew ▁crash ▁land ▁on ▁a ▁planet ▁in ▁the ▁year ▁ 3 8 8 9 . ▁They ▁find ▁primitive ▁humans , ▁but ▁are ▁attacked ▁by ▁hun ters ▁on ▁horse back ▁who ▁are ▁revealed ▁to ▁be ▁intellig ent ▁ap es . ▁The ▁ap es ▁kill ▁the ▁crew ▁and ▁capture ▁U ly ss es , ▁bringing ▁him ▁to ▁a ▁medical ▁center ▁for ▁study . ▁Human ▁slave ▁Jon ah ▁s ne aks ▁U ly ss es ▁a ▁key ▁that ▁allows ▁him ▁to ▁escape . ▁Ex pl oring ▁the ▁center , ▁U ly ss es ▁over he ars ▁the ▁ap es ▁Z ira ▁and ▁Dr . ▁Z ai us ▁discuss ing ▁his ▁fate ; ▁Z ai us ▁wants ▁him ▁executed