Super Empire Strikes Back for the SNES. you will rip your hair out playing that game.
Im in my 30s, the snes was the first console i properly played. This game was right up there on difficulty. Even with codes like invincibility it was still hard to get to the end. I kept going back to settings to ensure i was on easy mode. I was in my early teens i think when this was out so i dont know how i would do if i was confronted with it in my late teens early twenties when i could crack almost anything.
I think all the star war games were pretty taxing. I was more of a zelda fan but the best thing about the snes were all the platform games. good times