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.
The original kaizo hack, it's still pretty fun to try to beat savestateless. The lack of a retry option and no infinite lives by default hurts it when comparing with modern kaizo hacks.
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