Super Mario World(for the Super Nintendo), has a program which allows you to edit levels, and different aspects of the game. A Kaizo hack refers to a modified version of the game(KAIZO mario world), that is extremely hard, and usually requires many game-overs, or emulator tools to complete even one level.

Kaizo hacks usually include aspects such as these:
1. Forcing you to do certain things in a level which were normally not necessary in the original Super Mario World
2. Giving you power-ups, JUST to take them away from you to get passed another part
3. Making the time limit low so that the player must complete the level very quickly
The pit of despair by MoltovMarioWorld, is an extreme example of a kaizo hack. Evil Mario World by Danmakufublargel, and Training for kaizo by PostCardmy are other examples.
by 4lbatross February 9, 2009
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A "trap" that can cause the player to die after completing a level, thereby forcing them to do it all over again. It's usually caused by flaws in design, although it can be intentional.

Named for a level in Kaizo Mario World where the player must active a P-Switch before hitting the goal, or Mario will walk off into a pit of lava and die, negating the victory.
"ARE YOU SERIOUS??"

-JonTron, after falling for the OG Kaizo Trap
by Someone who kinda exists August 3, 2021
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Kaizo Mario (or "Asshole Mario" in English) is a notorious trilogy of sadistically difficult Super Mario World ROM hacks.
While Kaizo Mario has become infamous for pioneering the way for many extraordinarily difficult ROM hacks, some hardcore gamers look upon them fondly as an actual challenge. You can often find them in Super Expert on Super Mario Maker.
by Someone who kinda exists August 2, 2021
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A boss in a video game which is exactly the same as a previous boss, only it's redesigned to be more difficult.
The Bowser battle in Super Mario World is already much tougher than it looks. But the Kaizo Mario variant takes it even further. You thought he was difficult normally? Try fighting him when he's INVISIBLE! Behold the Kaizo Boss!
by Someone who kinda exists January 2, 2022
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A Japanese word slang for “tuning” or “modifying”.

The original meaning of Kaizo in Japanese is “reconstruct” or “modify”. And the word can be used in a way referring to remodeling something and or changing a setup.

However This term is typically used by 走り屋 (Street racers) or in general Car people. It refers to Tuning a Vehicle or modifying a car with aftermarket performance Tuning parts.
Jon: yo how’s the GT-R doing bro.
Ty: ah not too bad man. Just got it done by Mine’s Motorsports over in Yokosuka, it went through some kaizo. It’s bumping about 600hp now
Jon: ah shit man nice. Mine’s is badass when it comes to doing to kaizo on GT-R’s
by 湾岸 December 18, 2022
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