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Not too much has been found missing in Sonic Shuffle, but these images show the only current thing which didn't appear in the final game. On these images you'll notice a fist symbol on the ground, they aren't in the final game. They might have appeared in the prototype instead of the character specific circles like Amy's hammer and Knuckles' climb moves. Clikc the image for a larger version.

Another image showing off the same mysterious icon. Click the image for a larger version.

A very early shot of Sonic grabbing the gems. Note how the Sonic Shuffle logo is along the ground with no obstacles around at all. Click the picture for a larger version.

In this minigame in the final, and box that the character grabs is different to what is shown in this image. Click the picture for a larger version.

Although a minor change, the Dolphin icon has an orange colour surrounding it in the final, rather than green.

This is an image from a more final version, but as you can see, 3 of the 4 character pictures have changed! Sonic, Tails, and Knuckles now use a different character artwork. Any image you can find of Sonic Shuffle has the older character artwork, including every single image from IGN.com

prototype icons