I love tetris. It might be the first real game I played over and over again. I know I had a copy for my DMG (gray gameboy) growing up.
Sometimes, if I drink enough coffee early in the morning, my ADHD does that thing where instead of energizing me, it just makes me want to take a big nap. The last couple of times I had this happen, my first thought was "I should play some Tetris". I've done it twice so far when feeling that foggy, sleepy feeling, and each time I feel like it wakes me up, and knocks me out of that fog.
Anyway, Tetris is cool.