Super Mario Zero 2 is a new and brutal redesign of the original Super Mario Bros. featuring 6 worlds and 1 bonus level. It starts off challenging but quickly becomes unfair. While it is definitely possible to complete without save states (I did it twice), I recommended at least practicing the harder parts with states to reduce frustration. This hack is certainly meant for a special breed of masochist, even moreso than the first game.

Notes:
-There are 2 required deaths indicated with check marks in 1-2 and 3-1 to avoid stuff glitching out.
-Backwards jumps to accelerate you faster may be needed in parts.
-Jumping off an enemy while you are both ascending will give you a higher bounce.
-If you ever need to make a coin bridge, you need to activate all the blocks due to the glitchiness of placing them side by side.
-World 6 requires execution of a few glitches to proceed. 
-If you get stuck look up my playthrough on Youtube