Girlfriend complained about the difficulty on d3

D3’s difficulty is determined by the GR level you play vs your paragon. Doing 120 with 800 paragon is hard, doing it with 2000 paragon is not hard.

Regarding Super Mario games, they are pretty hard, I have only completed one of them (Super Mario Land 2, Gameboy). New Game +3 in Dark Souls stands out as easier for me.