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It gives the newly introduced Knuckles the Echidna the starring role, alongside a new group of characters informally known as the "Chaotix", collectively stopping Dr.
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Time Attack messes up the screen, but you can still see the characters spinning.Once you pass the Combi Catcher part of the level hub, you can go back instead of it being locked off.The partners you can choose are Mighty (as a ? box), an unselectable ? box (possibly the unused character), Charmy, Vector, Bomb, Heavy, and another ? box, which is actually Espio. You are allowed to choose your partner manually. The Combi Catcher exists, but it gives you items which don't work (the tube comes out and nothing happens.) To choose your partner, wait until after choosing a stage.Invincibility boxes only give the character who breaks the box invincibility instead of both like in the final.However, they still seem to work for the most part. Once you collect an item box, its icon does not appear at the bottom.There is no limit for the amount of negative rings you can have.The gameplay is also different in this prototype.
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This is the first version with the zoomed in title screen background.
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