Sonic World

Sonic World is the first fully 3D "Adventure Field" included in the collection Sonic Jam. It is also the selling point of the game as fans were eager to play as Sonic in a 3D environment. Sonic World takes place on Neo South Island and (for a small location) has lots of places and things of interest.
 * Seven Museums on Sonic and his games.
 * 100 rings scattered around the place.
 * Other nostalgic equipment like Lampposts and Springs.
 * Cheat Cards. (which resemble Item boxes but you can't damage them)
 * Tails flies around the place.

Character House
This museum has 2 entrances, the entrance with Sonic's bust statue by the door is part of the museum with information and pictures on Sonic, Tails, Knuckles and the rest of there friends. The entrance with Dr. Robotnik 's bust statue is about himself and his robots.

Music Shop
Got all the music and sounds from the games except Sonic World.

Movie Theatre
This museum contains videos related to Sonic and his games.

Art Gallery
Professionally drawn artwork of Sonic, Sonic & Tails, and Sonic & Friends.

Hall of Fame
Tells the extensive history of Sonic the Hedgehog series.

Missions
By jumping on a big red and white button near the exit of Sonic World, you can play missions, once a mission is acomplished, you can play the one afterwards. Once all the challenges are met, a Warp Ring will appear which will present the credits.

Trivia

 * According to the Sonic City website, Sonic World is a test level for what eventually became Sonic Adventure.
 * The same 3D models for Sonic and Tails were used again in Sonic Jam.
 * The music to Sonic World was used again in Sonic Classic Collection which also had the same games as Sonic Jam, but for the Nintendo DS. Apparently you cannot play Sonic World on that collection.