About Super Mario World Hack
This is a 'hack' version of Super Mario World, also known as Super Mario Bros. (both titles appear in-game) also exists, which is a copy of Squirrel King and uses ripped graphics from Super Mario Bros.
Newly-drawn sprites to make the Squirrel King characters look more appropriate are used as well. Despite its overhauled appearance, the gameplay was unchanged, so, unlike the original Super Mario Bros game it resembles, Mario and Luigi are unable to stomp on enemies and must instead throw crates at them.
Instead of the rabbit and the monster, Bowser replaces them as the first and second boss, and in the hack, the bird on the machine is the fourth boss and the pig is the third boss.
Mario's sprite was normally more similar to the Super Mario All-Stars franchise, with Luigi carrying the same sprite as Mario, with Luigi's shirt being the normal green color.
Source from https://en.wikipedia.org/wiki/Squirrel_King
← → ↑ ↓ = Move
Enter ↵ = Start
Space = Select/Mode
Z = A
X = B
C = C
A = X
S = Y
D = Z