You need to collect all Seven Chaos Emeralds. In Knuckles story it take you a little longer because your not the same route as Sonic & Tails. In order to get all seven Emeralds you need to go through Giant Rings and do a Special Stage for each one of them. Once you finished a special stage you will receive a Chaos Emerald if you lose you can try again but the same Ring won't reappear in the same spot so you need to look all over the area to find more.
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Collect all seven choas emerald.
no
You can play them in the Sonic Mega Collection Games, but not in Sonic Gems:i can go super sonic says:but you need to unlock sonic 3 and knuckles that's what i had to do!
No, you can not by Hyper Sonic in Sonic Rush. For Sonic to go Hyper, he needs the 7 Super Emeralds, which Sonic Rush does not have. The Super Emeralds were only in Sonic 3 & Knuckles, so Sonic can only go hyper in Sonic 3 & Knuckles.
Get all the chaos emeralds then collect 50 rings.