Big heads towards the Emerald Coast and finds Froggy on one part of the Great Sea. After fishing him out, Big turns to go home, but E-102 Gamma grabs the crazed frog from Big and heads off somewhere, with the worried feline pleading behind it. Big boards the Egg Carrier, and tries to pick up Froggy's scent, but fails, so he decides to find him in the Hot Shelter. He realizes that to get Froggy out, he must activate the switch. After doing this and fishing Froggy out for the last time, Big turns to exit, but is transported to the past. He encounters Tikal for the first time, before returning to his normal time. He gets out of the Attendance room and heads out, but spots Chaos and freezes in horror at the sight of him. Dr. Robotnik arrives and gives Chaos the Emeralds, causing him to enlarge again. Froggy then hops into Chaos' body, restoring the beast's tail. Sonic arrives and realizes Chaos has gotten bigger, then Big carefully fishes Froggy out of Chaos' body and escapes under the hedgehog's orders. Suddenly, the Egg Carrier is about to lose altitude, but Big spots the Tornado 2 and flies to the jungle moments after the flying fortress self-destructs and crashes into the Great Sea.
After its defeat, Chaos is reverted to his Chaos 0 form, as his anger and rage has faded. He spots several Chao, and knows of their peacefulness. Tikal arrives and tells Chaos that the Chao have been living peacefully with mankind for a long time and will continue to do so. With the fighting over and harmony restored, Tikal and Chaos ascend into the sky and disappear in a flash of white. Seconds after, Robotnik flies away. Peace is back once more, and Sonic runs off in search of more adventures.
As a launching game for the Dreamcast, Sonic Team needed to show off what the console was capable of doing in an appealing way to the public. In order to achieve a more natural, realistic feel to the exotic levels like ruins and jungles, the core members of the Sonic Team traveled to the Americas. The Team's journey began in the northern part of the peninsula in the Chichen Itza, from there the team traveled southward along the Eastern side of the Peninsula where they also visited Cancun, Tulum and finally Tikal. The team then left the peninsula traveling down through Central America, into South America, Peru, where they visited Cuzco, Machu Picchu and then Ica. The Chichen Itza and Tikal provided the aesthetics concept of the Shrine of Knuckles's race, Chaos and the serpents drawing on the walls of the temple; Cancun and Tulum provided the concept of Emerald Coast; Cuzco provided the Altar of Emerald; Machu Picchu provided the design of Windy Valley; and Ica provided the the aesthetics for Sand Hill. However, the trip was not all fun and games, the team having unexpected encounters with giant spiders, snakes, and reportedly Yuji Naka becoming ill at one point. At the end of it all, the team returned to Japan in one piece, full of enthusiasm to create the game. During the trip, the developers photographed the actual ruins, then processed that data, and used them in-game as textures to create a sense of realism and enliven the feeling of adventure.
The sound director and lead music composer of Sonic Adventure was Jun Senoue, who had already composed tracks for Sonic the Hedgehog 3 and the Sega Mega Drive version of Sonic 3D Blast. Back then, there were two types of music in Sonic games: the tracks in the Mega Drive games, and the "house-dance" music in Sonic the Hedgehog CD and Sonic R. Since this game was a big turning point for the franchise, being the first fully 3D title and the first one in a new console, the team decided to change the music genre as well. After extensive trial and error, they chose to have rock music as the game's soundtrack in order to synchronize with the atmosphere on the screen. Each of the tracks in the game were not pre-recorded, but rather live tracks that were made to demonstrate the potential of the Dreamcast. Senoue wanted to retain the classic Sonic soundtrack whilst adding a harder edge to it; various of the tracks from previous games he had composed were reused in Sonic Adventure. These included the jingles from Sonic the Hedgehog 3 and various of the tracks in Sonic 3D Blast.
Sony Computer Entertainment Europe announced the PlayStation 3 Slim, a smaller and lighter model of the console and a release date of 1 September 2009. Firmware 3.0 for the PlayStation 3 was also announced, adding new features to the PlayStation Network. Sony announced that the European Video Store would launch in November 2009. Sony also announced that the PlayStation Portable would get smaller games (under 100mb) in the form of 'minis' and that comics would also be available to download in December 2009. A "free game" registration promotion was announced for the PSP Go.
Microsoft Game Studios announced Fable III, along with a release date of 2010. Also, Microsoft announced their intention to release Fable II on the Xbox Live Marketplace in five episodes, the first of which will be free to download. 2b1af7f3a8