3-4 is one of hte areas where you deliberately have to be small mario to progress. So if you do have the big mushroom you have to get yourself hit by the piranha plant and go to the bottom floor that only small mario can fit to progress

The games get lot harder in the later area

The big trampolines is difficult but it’s manageable, it’s the small trampolines that the jumps is much less that kills me

I think there is something unique of someone not just creating a difficult challenging game vs the game that is actively trolling the player and playing a joke on you. It’s the most mischievous of hard video games