This hack removes all the progress-blocking lava up to before the area of the last Alpha and first Omega. So basically nonlinear Metroid II.
Database match: Metroid II - Return of Samus (World)
Database: No-Intro: Game Boy/Color (v. 20210227-015730)
File/ROM SHA-1: 74A2FAD86B9A4C013149B1E214BC4600EFB1066D
File/ROM CRC32: DEE05370