From Sonic Retro
Sonic Shuffle had gone through several changes over its development process. There are several rejected ideas, levels, and other things that were left on the cutting room floor. The following details several of these things.
The boxes that the characters grab in Manic Maze are different than in the final.
All the characters here have old artwork recycled from Sonic Adventure. In the final, they're given custom-made icons.
Different expression on Tails' face.