▁and ▁the ▁Jung le ▁River ▁att raction . ▁The ▁game ▁used ▁the ▁film ' s ▁original ▁planned ▁ending , ▁in ▁which ▁Grant ▁would ▁eliminate ▁the ▁vel oci ra pt ors ▁by ▁manip ulating ▁a ▁Ty ran n osa urus ▁re x ▁ske leton ▁in ▁the ▁visitor ▁center . ▁The ▁game ' s ▁vol cano ▁level ▁was ▁not ▁featured ▁in ▁the ▁novel ▁or ▁the ▁film . ▁Sam ▁Pow ell ▁composed ▁the ▁game ' s ▁music ▁and ▁sound ▁effects . ▁By ▁June ▁ 1 9 9 3 , ▁the ▁development ▁team ▁had ▁been ▁working ▁on ▁the ▁game ▁for ▁ 1 5 ▁months . ▁The ▁game ' s ▁development ▁had ▁been ▁kept ▁secret ive ▁up ▁until ▁that ▁month , ▁when ▁the ▁game ▁was ▁public ly ▁un ve iled ▁for ▁the ▁first ▁time ▁at ▁Chicago ' s ▁Summer ▁Cons umer ▁Electron ics ▁Show . ▁Jur ass ic ▁Park ▁was ▁the ▁first ▁film - based ▁video ▁game ▁to ▁give ▁players ▁the ▁option ▁of ▁playing ▁as ▁a ▁protagon ist ▁or ▁ant agon ist . ▁ ▁Release ▁Jur ass ic ▁Park ▁was ▁released ▁in ▁the ▁United ▁States ▁on ▁August ▁ 1 0 , ▁ 1 9 9 3 , ▁and ▁was ▁the ▁first ▁video ▁game ▁to ▁util ize ▁S ega ' s ▁new ▁ratings ▁system , ▁receiving ▁a ▁G A ▁( General ▁Aud ien ces ) ▁rating . ▁ ▁Re ception ▁Appro xim ately ▁ 2 5 0 , 0 0 0 ▁copies ▁were ▁sold ▁within ▁the ▁first ▁week ▁of ▁the ▁game ' s ▁U . S . ▁release ,