Sonic needs another game like Secret Rings, but with improved controls. Not necessarily on rails, but in a fairly narrow environment so as to solve camera issues without taking away the game's sense of speed.
Less focus on collecting and solving puzzles (like in Sonic '06) is also a must.
Get rid of all the excess characters, and focus on Sonic, Tails, Knuckles, and Eggman. The others can make appearances, but I seriously get sick of playing as Big the Cat.
Less Amy Rose=more win.
We also need less focus on storylines. No one plays Sonic for the story. Better voice actors and sound tracks would help a lot too.
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