There were a lot of those old NES games that I could never beat. I remember Battletoads being nuts, Ghouls N' Ghosts being tough, there was kind of a bunch cause some of those old games were just stupid hard lol
More recently Dragon Balll Xenoverse almost beat me cause it was gonna get to the point I was gonna have to grind for 5 to 10 hours to try and overpower the story mode, but thankfully I realized I could just cheese out the enemies by going Super Saiyan 2 and spamming a powerful area attack blast that allowed me to take out large chunks of health with each blast. I hate having to beat a game like that, but when they force me to grind on their annoying side missions with annoying AI and annoying combat, I'm gonna take the path of least resistant and rely on the cheapest move I can find lol