It's a key factor to almost every Sonic game. A few exceptions like the "Adventure " games and Game Gear titles such as "Sonic 2" are few and far between. The Sonic games have always been about speed. Both the game play and the technological base for creating/playing the games yell it out. But one factor remains in most of these games that doesn't necessarily follow with this.
The most powerful component of any Sonic game. The key to victory or defeat. Evils such as Chaos and Dr. Robotnik/Eggman have used it. The one factor of the Sonic franchise that has met with considerable change both in style and story. One thing has remained the same, truly the same, about them. They are "A jewel containing the ultimate power." Chaos emeralds. They may be the single most important item, aside from rings, in any Sonic game. They have probably undergone the most changes out of any item in the series. Going from a base of 6 chaos emeralds to 7. Different versions have arisen such as the "Time Stones." To make things more interesting, "Super Emeralds" were introduced when Sonic 3 was combined with Sonic & Knuckles. Changing from just a powerful jewel to a keystone that is fueled by and channels the energy of one's own self, that is their heart. But what about the acquisition of Chaos emeralds?

