I've played Tetris everyday for the past 15 years, so I feel John's anxiety on this.

The solution is simple though:

- NES emulator for Mac: https://openemu.org/

- Tetris ROM: https://www.emuparadise.me/Nintendo_Entertainment_System_ROM...

However beware, if you go deep enough down the Tetris rabbit hole then you'll inevitably find yourself buying an original NES and getting a CRT just to play Tetris as God (Alexey Pajitnov) intended.

Alternatively you can buy a USB NES Controller and play with that instead of buying the whole thing.