: Change the instruction so it always returns the ID for the long piece (often 00 or 01 depending on the version).
To permanently change the game code, you must modify the ROM's assembly. Most classic arcade Tetris versions (e.g., Sega System 16 ) use or 68000 processors. Tetris Rom Mame
: You can use the MAME debugger ( -debug ) to find the memory address that stores the "Next Piece" ID and manually freeze it to the value of the long piece. 2. ROM Hacking (Assembly) : Change the instruction so it always returns
If "developing" means changing the actual look or dimensions of the long piece: : You can use the MAME debugger (
For further technical documentation on how these ROMs are structured, you can check the MAME Dev Wiki or source code on GitHub . Final Tetris Corruption, possible regression #3004 - GitHub