This hack turns the original seven figures of tetraminos into trominos, dominos and monominos, making the game way easier, there's a few palettes improvements as well.
Tetris (USA) (Unl)
File MD5 1BCB1795A0FEED766D6D0681196662FB
File SHA-1 34113A102CCFFF6A859F8EBB66C24260D43EC7AB
File CRC32 88F071C3
ROM MD5 117C38986584C88263414B7ABB98667C
ROM SHA-1 E675D418256854070F76136602DFC7545F5171AE
ROM CRC32 343C7BB0