I remember when Tetris first came out on the C64. Cos the game was so simple, it used very little RAM, so they had loads of free memory for a 25 min long bit of music by Rob Hubbard {who was the best.}
It was genius because the C64 SID chip that made the music only had 3 channels. But Hubbard found that every time you moved the vol up or down one, it made a click, and he could change the waveform of the click. So 25 times a second, he'd set the waveform of the click, move the vol up from 97 to 98, then reset the waveform and move the vol back down one.
This allowed a form of sampling on a 4th channel. Look. Genius.
https://www.youtube.com/watch?v=Ny743c32gPg
Sorry, I'd a bit geeky on this. Wrote for Games Computing, Computer Gamer and Your Commodore between the ages of 11 and 15 in the '80s. I was the computer expert on Junior Watchdog one episode in the school hols.
So in short, it's ok to still play Tetris as long as you're playing on a Commodore 64, pref using a Quickshot 2 joystick. {Though I personally had a very rare Quickshot 9 joyball. As opposed to it being like a willy you grabbed in your wrist with a finger trigger button, it was like a tit you put the palm of your hand on, and used your other hand to press the fire buttons on the side.}