Romhack which adds:
1. New structure of levels;
2. New palette of levels;
3. New music;
4. New graphics, etc.
Database match: Sonic The Hedgehog (Unl) [!] - NOINTRO
Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
File SHA-1: B047CB483EACA3590895006DC459C22EE3855AF8
File CRC32: 131E6617
ROM SHA-1: 9960FCB35F81A8E685CC72D61DFD62CBB78967DA
ROM CRC32: D56ED9FC