Sonic World (level)
From Sonic Retro
Sonic World is a short 3D level, found in Sonic Jam which is set in a grassy plains environment similiar to Green Hill Zone. There are plenty of objects to interact with, such as springs, moving platforms and rings (100 total). Gameplay in these levels is similar to Classic Sonic games as movemment is handled with the directional pad (or analogue stick) and 
, 
, or 
buttons are used for jumping. No spin-dash is avaailable. The camera view can be adjusted with 
, 
, and 
buttons. The camera can be rotated with the 
or 
buttons. There also cheat cards that can be found in the level which reveal cheats for each of the available games.
According to a Retro Gamer Magazine Article Sonic World was a prototype Sonic Adventure, compiled based on what work they had done on the Sega Saturn version of the game. This was also revealed in the trivia section of the Sonic Advance 2 strategy guide.
Missions
No enemies are in the level, but there are 8 missions that can be completed. The missions are started by jumping on the red and white platform near the entrance. This is also where the player must go to complete a mission. If a mission isn't completed by the time the time limit counts down the mission will end in faliure and the player will need to start over. A failed mission is signified by a sound effect being played when the timer finishes counting down.
Museums
The level also houses five museums which contain artwork, videos, and music for the games found on this compilation. These museums are called "Character House", "The Music Shop", "Movie Theatre", "Art Gallery", and "Hall of fame".