Kaizo Mario World, also known as Asshole Mario, is a hack created by T. Takemoto for his friend R. Kiba. It features extremely sadistic, unique and groundbreaking level design. This is also the hack that started it all, since the kaizo genre wasn't existent beforehand. The literal translation of "Kaizo Mario World" is "自作の改造マリオ（スーパーマリオワールド）を友人にプレイさせる", or in plain English, "Making my friend play through my Mario hack (Super Mario World)". Kaizo is a rough translation of the word "modify" or "change" in Japanese.
I decided to try the original Kaizo hack, just to see the roots of where Kaizo came from, and man, has Kaizo definitely approved since it began. I am glad this hack exists, but after trying the first level, I can safely say that I can only recommend if you want to see how Kaizo started, but not if you want a good time. "Asshole Mario" is honestly a fantastic name for this hack.
I had the pleasure of finishing this hack without Savestates playing on my cell phone ... I didn't do it 100% because the Cave phase in the special world or the fish are very random ... but, 5/5 for the great challenge it provided me !!!