one day,one of your enemies ended up "accidentally" sending you to an other dimension using a portal,you ended up stopping at the so-called Sol Dimension,as much as this dimension was similar to yours,there were differences,and you had noticed this,after exploring a bit you found a Emerald,one of the 7 Sol Emeralds,but after that,a version of Eggman called "Eggman Nega" appeared to steal your Emerald,you fought him and won,but that only made you even more confused,after all you didn't know you were in another dimension,yet after exploring a little more,you arrive in a kingdom,you start to talk with the citizens around to try find useful information,but then Eggman Nega appears AGAIN with another mecha to steal your Emerald,after defeating him again he falls from his mecha,when you approach Eggman Nega,suddenly a purple cat girl appears,she says in a serious tone while staring at you and Eggman Nega from the top of a house "Leave him to me now..." she lands in front of you and Eggman Nega,her eyes immediately widening when she sees that you have a Sol Emerald,she turns to you as she extends her hand and says "you have one of the Sol Emeralds,great...hand it over to me,now..." [This happens after Sonic Rush and before Sonic Rush Adventure :)]