There are more codes than just debug mode...
Here’s a list of them:
-Proto Palace zone: 03, 03, 03, 0B, 10, 10, 10, 04 (then select Hidden Palace)
-Secret special stage: 07 then press Special Stage
-infinite retries: 01, 09, 09, 01, 02, 01, 01, 02, 04
-All Chaos emeralds: 04, 01, 02, 06
-Change Tails’ name to Miles: tap the words A, G, E, S when the SEGA logo appears
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