friend Tails learns that the two dimensions are merging somehow, and both will collapse if the process is not stopped. Suspicious of Blaze, Sonic and Tails begin searching for her. Upon finding Blaze and Cream, Sonic questions Blaze about her nature, but she refuses to give any information and leaves with Cream. Sonic follows her to Eggman Nega's base, where it is revealed that Eggman and Eggman Nega are working together to collect both the Chaos Emeralds and the Sol Emeralds. Blaze declares that she is the only one who can save their worlds, without anyone's help. Sonic and Blaze fight each other, until Sonic wins the fight and Blaze realizes the error of her ways. After Eggman kidnaps Cream, Blaze goes after him while Sonic takes on Nega. Sonic collects the last of the seven Chaos Emeralds and catches up with Blaze, who fails to prevent Eggman and Eggman Nega from draining the Sol Emeralds's power for their Egg Salamander mech. As the world begins to destabilize, Sonic and his friends help Blaze realize the meaning of friendship. This restores the Sol Emeralds, and Sonic and Blaze use both sets of Emeralds to transform into Super Sonic and Burning Blaze. The two destroy the Egg Salamander, restoring the dimensions to normal, and Blaze returns to her world, now better understanding her powers. Cream is saddened by Blaze's departure, but Sonic assures her that Blaze promised to return someday. Development Sonic Rush was developed by Sonic Team and Dimps, and published by Sega. Yuji Naka, Sega's executive managing director, announced the game at Electronic Entertainment Expo (E3) 2004, along with Project Rub. A demo of the newly titled Sonic Rush was featured at E3 2005, and won video game publication IGN's "Biggest Surprise" award. Blaze the Cat, a new character, was revealed at Tokyo Game Show (TGS) 2005. The game's 2.5D format was based on Sonic Team's idea to combine elements from 2D and 3D games in the series. Director Akinori Nishiyama stated in a September 2005 interview with GameSpot that Sonic Team "wanted to keep the elements from 2D, yet still explore some of the new elements from 3D." At TGS 2005, he stated that while working on Sonic Advance 3, he realized that the series was becoming more complicated, opting for a "fast, dynamic action" approach to the next title in the series. The music was primarily composed