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Super Sonic

Become Super Sonic.

Super Sonic0
4 guidesOffline Game ModeSingle PlayerCooperativeCollectableMissable
09 Sep 2008
25 1 0
If you read the "Chaos Master" achievement guide, you'll see that you need to collect seven Chaos Emeralds. Doing so will allow you to transform into Super Sonic provided that you collect 50 rings first.

As soon as you jump after collecting 50 rings you'll turn into Super Sonic and you will get this achievement.