▁about ▁to ▁take ▁a ▁hol iday ▁when ▁T ails ▁not ices ▁an ▁advert is ement ▁for ▁a ▁" World ▁Grand ▁Prix ". ▁While ▁not ▁initially ▁interested , ▁Son ic ▁not ices ▁that ▁Dr . ▁Rob ot nik ▁is ▁also ▁particip ating ▁in ▁the ▁race , ▁which ▁persu ades ▁him ▁to ▁change ▁his ▁mind ▁and ▁enter ▁the ▁race . ▁It ▁is ▁revealed ▁that ▁Rob ot nik ▁has ▁recently ▁learned ▁of ▁the ▁where about s ▁of ▁the ▁rare ▁and ▁powerful ▁Cha os ▁Emer ald s , ▁with ▁which ▁he ▁asp ires ▁to ▁ens lave ▁the ▁world , ▁and ▁the ▁World ▁Grand ▁Prix ▁is ▁actually ▁a ▁trap ▁used ▁to ▁dist ract ▁Son ic . ▁Kn uck les ▁and ▁Amy ▁over he ar ▁of ▁Rob ot nik ' s ▁plan ▁and ▁decide ▁to ▁comp ete . ▁T ogether , ▁the ▁four ▁must ▁balance ▁both ▁winning ▁races ▁and ▁obtain ing ▁the ▁Cha os ▁Emer ald s ▁to ▁keep ▁them ▁out ▁of ▁Rob ot nik ' s ▁reach . ▁ ▁Development ▁ ▁After ▁the ▁completion ▁of ▁Son ic ▁ 3 D ▁Bl ast ▁in ▁ 1 9 9 6 , ▁S ega ▁approached ▁Tra v eller ' s ▁T ales ▁about ▁working ▁on ▁another ▁Son ic ▁game , ▁this ▁time ▁being ▁a ▁racing ▁game . ▁Tra v eller ' s ▁T ales , ▁who ▁coinc ident ally ▁had ▁been ▁working ▁on ▁a ▁ 3 D ▁graphics ▁engine ▁without ▁a ▁purpose ▁at ▁the ▁time , ▁found ▁this ▁to ▁be ▁a ▁logical ▁pro gression , ▁and ▁accepted ▁the ▁project . ▁Tra