player ▁game ▁designed ▁by ▁Marc ▁Miller ▁and ▁Frank ▁Ch ad wick ▁in ▁which ▁a ▁mad ▁scient ist ▁has ▁program med ▁a ▁computer - control led ▁astero id ▁to ▁crash ▁into ▁the ▁Earth , ▁resulting ▁in ▁an ▁ext inction ▁level ▁event , ▁and ▁only ▁one ▁spaces hip ▁is ▁able ▁to ▁intercept ▁the ▁astero id ▁and ▁try ▁to ▁save ▁the ▁world . ▁ ▁One ▁player ▁must ▁put ▁together ▁a ▁team ▁of ▁advent ur ers ▁— ▁accompanied ▁by ▁S asha ▁the ▁dog ▁— ▁that ▁will ▁try ▁to ▁overcome ▁the ▁computer ized ▁def enses ▁of ▁the ▁astero id ▁and ▁start ▁the ▁self - dest ruct ▁sequence ▁that ▁will ▁destroy ▁the ▁astero id . ▁The ▁other ▁player ▁arr anges ▁eight ▁ge omorphic ▁t iles ▁to ▁represent ▁the ▁astero id ' s ▁cave ▁system ▁and ▁controls ▁the ▁astero id ' s ▁robot ic ▁def enses . ▁ ▁There ▁are ▁several ▁special ▁rules ▁for ▁various ▁person ality ▁interactions . ▁For ▁example , ▁S asha ▁the ▁dog ▁h ates ▁a ▁person ▁called ▁Carter , ▁and ▁will ▁not ▁go ▁through ▁any ▁door ▁that ▁Carter ▁has ▁opened . ▁▁▁▁ ▁Both ▁players ▁may ▁come ▁across ▁some ▁of ▁the ▁mad ▁scient ist ' s ▁other ▁invent ions , ▁including ▁a ▁dis integr ator ▁p istol ▁and ▁an ▁in visibility ▁bel t . ▁ ▁There ▁are ▁various ▁victory ▁conditions ▁that ▁the ▁players ▁can ▁claim ; ▁for ▁example ▁The ▁World ▁Pres ervation ▁victory ▁is ▁achieved ▁if ▁the ▁computer ▁is ▁destroyed ; ▁or ▁an ▁SP CA ▁victory ▁is ▁claimed ▁if ▁S asha ▁the ▁dog ▁surv ives , ▁and