The original Tetris for the Game Boy when played in multiplayer mode had a limit of 30 lines.
With this patch you have an unlimited number of lines, the counter will stay at 30.
There is a patch for Tetris (World) v1.0 and v1.1.
Database match: Tetris (Japan) (En)
Database: No-Intro: Game Boy/Color (v. 20180815-131105)
File/ROM SHA-1: 3F2A6407C9900AD5817EE1CFB3609C5EE17400FC
File/ROM CRC32: 63F9407D