They use the original NES cartridge with slight modifications, according to this thread: https://www.reddit.com/r/nes/comments/5b0b5l/anyone_know_how_the_tetris

They use the original NES cartridge with slight modifications, according to this thread: https://www.reddit.com/r/nes/comments/5b0b5l/anyone_know_how_the_tetris_world_championship/ https://www.reddit.com/r/nes/comments/5b0b5l/anyone_know_how...