When I was a kid in the 80’s and 90’s, you only owned a few games if you had an NES or SNES (or Sega equivalent) even if you rented/played a lot of them. So, I got insanely good at the few games I owned. After I beat Street Fighter II with every character on the highest difficulty, I decided to beat the game using only one button (plus the D pad, obviously). Finally did it with Chun Li and X button.
With Super Mario World, the hardest personal challenge I did was beating every level except the switch blocks. There’s a bunch of secret exits where switch blocks are supposed to be the way. It took a lot of cape+blue Yoshi shenanigans to get that one done.
Now that I’m old (or least older) and games are way longer, my biggest accomplishment is actually finding time to play a game all the way through, much less do side quests. I made time for BoTW, Horizon Zero Dawn, Nier: Automata, and Hades. But if I stop playing a game for awhile, I forget all the controls and that’s the end of that game.