Apparently the day-time levels are being made by...the same people who made Sonic Rush on the Wii version while it's the Sonic team making the day-time levels for 360 and PS3.
Night-time levels are being made by the Sonic team for all platforms.
07/07/2008
Super Smash Bros. Brawl
QUEEEEEEEEEEEENNNNNNSSSSSLLLLLLLLLAAAAAAANNNNNNNDDDDDDERRRRRRR!