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File:Kaizo 2508.png

"...this is like the video game version of cutting yourself."

"Either that, or make more hacks... Either way, the results are torture to mankind."

Welcome to Hell.

An insanely difficult Game Mod of Super Mario World, Kaizo Mario World (literally, "Hacked Mario World", but also translated as "Asshole Mario World") is well known for being the Trope Codifier of the Platform Hell genre (well eclipsing the popularity of earlier examples such as Jinsei Owata no Daibouken and the then-unnamed Super Mario Forever), and for being the game that launched a lot of LPers' careers on YouTube.

The whole thing is rumored to have started as a simple Mario World hack made by a Japanese internet user to challenge their friend, and by some unknown stroke of luck, was found and LPed by a team of Something Awful LPers as 'Asshole Mario World', based off the difficulty. The popularity of these original playthroughs spread across the internet, causing a lot more people to play the game. The game is pretty much also responsible for the wave of "super difficult" Platform Hell Mario World hacks that have been released, including most on the trope page in question, and those designed specifically to be played by commentators on YouTube for the frustration of the player in question.

There was also a sequel, Kaizo Mario World 2, which was more of the same, with new levels and boss battles. There have also been a few unofficial sequels, although none have gained the popularity of the original.

Similar to Super Kusottare World ("kusottare" is Japanese for "asshole") and Super Tabarnak World ("tabarnak!" is a religious Quebecois swear). Compare to I Wanna Be the Guy.

You can get the original Kaizo here and Kaizo Mario World 2 here.

Tropes used in Kaizo Mario World include:
  • One-Hit-Point Wonder: Enforced; many passages are only big enough for the small one-hit Mario to pass.
  • Platform Hell: Most of the game, although taken to further and further degrees by imitators.
  • Press Start to Game Over: The title screen opens with a Thwomp crushing Mario, and quite a few levels try to kill you a couple seconds after they start.
  • Save Scumming: Beating this hack and others of its ilk legitimately is virtually unheard of.
  • Sequel Difficulty Spike: The second game just increases the hellishness of the first one.
  • Slippy-Slidey Ice World: Hope you have your ice sliding skills perfected, these games exploit the mechanic's difficulty for all its worth.
  • Speed Run: Especially the Tool Assisted kind. Some imitators are actually made purely for Tool Assisted Speedruns.
  • Spikes of Doom: As Munchers and normal spikes, and in great quantity in all levels.
  • Temporary Platform: Used throughout the mod, including the infamous Kaizo Trap.
  • Trial and Error Gameplay: You won't see many traps until you get killed by them. This is, again, one of the most common features of both the original and imitators.
  • Video Game Remake: Kaizo Mario Advance 2. How shall the gameplay of Luigi from the GBA version work with these levels?
  • Serial Escalation : How insanely difficult will this stage be? Practically gets turned into an artform.
  • Shout-Out: The third level of the first game is called Cerulean Cave, a reference to a location in Pokemon.
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