Some S3&K glitch
First debug mode needs to be active enter a level like angel island or sandopilous.
Find big ring and as soon as you enter it press B to enter debug and make sure you've selected the S monitor. This is a timing thing so this might take a while. If you complete the special stage it will say you got a chaos emerald even though no emeralds show up. You'll be told sonic can be hyper sonic and when you exit the big ring you'll turn into a glitchy mess. Collect 50 rings click C twice and you get a slightly more sparkling version of that glitchy mess.
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