I present to you three fresh categories that you can run, all are game genie codes:

PIGOAP

Swim everywhere and still keep running speed as you do it. Allows for FFPG and the code also places you in the middle of the level every time you enter a new world (considering there's only world 1, this only applies to 1-1).

Main objective is to get past 1-1 as quickly as you can, and, if you're playing the fixed version, to find a way to get through 1-3 with floating physics optimally.

TEYIUT

Regardless of where you are or what you are standing on, every time you press down, the game will act as if you're entering a pipe, and you can warp to the nearest sub-area on command. The catch is that you may have to travel a certain distance to load the warp. I'll let you experiment with that.

OZAOAT

Levels become a massive, scrambled mess of random generation by replacing current tiles with other objects. Every pipe is enterable. From the frame at which you enter a new room, every action you do, every input you make, and every subpixel you slow down, will determine how the level pages are generated.

This phenomenon in 1-2 occurs because of the conversion from "Good Grief" to this random scramble of pipes.

So what happens if you enter a pipe in 1-2 around here? Guess you'll have to find out, but if it were important, a category that requires quick thinking, a bit of luck, and some tricky execution would make for a very interesting concept.

BONUS: Can you find a way to enter a pipe in this current state?