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[[caption-width-right:350:You want your DarkerAndEdgier Super Mario?\\
[[PressStartToGameOver Here's your Super]] [[PrecisionFStrike Fucking]] [[PressStartToGameOver Mario]].]]

-> ''"This is the video game version of cutting yourself."''
--> --'''LetsPlay/ProtonJon''', [[http://www.youtube.com/watch?v=yiCm9FYZhBA&t=6m35s playing Kaizo's Special World 2]].

[[WelcomeToHell Welcome.]]

An [[PlatformHell insanely difficult]] GameMod of ''VideoGame/SuperMarioWorld'', ''Kaizo Mario World'' (literally, "Hacked" or "Remodeled" Mario World; known as ''Yūjin Mario'' in Japan) is well known for being the TropeCodifier of the PlatformHell 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 [[LetsPlay Let's Players]]' careers on Website/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 [[LetsPlay LPed]] by a team of Website/SomethingAwful [=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" PlatformHell ''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 Website/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 originals. In late 2012, ''Kaizo Mario World 3'' was created. ''[[http://www.youtube.com/watch?v=dwVpxttsKII&feature=plcp Lord help us all.]]''

KMW has inspired many imitators, among them ''Super Kusottare World'' ("kusottare" is Japanese for "asshole"), and ''Super Mario Tabarnak'' ("tabarnak!" is a religious Quebecois swear).[[note]]You can get all three hacks (as well as the creator's Pokémon hack) [[https://skydrive.live.com/?cid=032864261776C9F9&id=32864261776C9F9!105 here.]][[/note]].

The official fan editor ''VideoGame/SuperMarioMaker'' opened up opportunities for fans to create their own Kaizo-style levels ''sans'' the nitty-gritty of rom hacking. (Distributing ''Mario'' mods is a legal grey area, whereas sharing ''Super Mario Maker'' levels is not.) See [[https://www.youtube.com/watch?v=_sxY8pELhqM "Pit of Panga"]] for how ridiculous these levels can potentially be.

For the direct parody, see ''VideoGame/IWannaBeTheGuy''.
!!This game provides examples of the following:

* AscendedGlitch: You'll have to pretty much know a bunch of glitches in the ''VideoGame/SuperMarioWorld'' engine to get through this hack.
* BigBoosHaunt: The ghost houses are a sadistic homage to the already frustrating and labyrinthine ones found in the original. The Big Boo boss [[ThatOneBoss is made ridiculously hard]].
* BonusBoss: Arguably those at the end of the Special World.
* BrandNameTakeover: Thanks to this game, "Kaizo" is now fandom speak for any ridiculously hard SMW hack or any hard ROM hack in general; several other hacks have adopted the name Kaizo, such as Kaizo Mario Bros 3 and Kaizo Mario 64.
* ButtMonkey: Luigi gets dogged even though he isn't directly the protagonist. Why is this relevant? [[spoiler:At the end of the Third Kaizo Mario World, the game shows the total number of deaths you got throughout the game. Get 200+ deaths? You are ranked as ''Luigi'', who is worse than a water flea (100-199 deaths).]]
* CouchGag: Each of the three games have variations on the opening Thwomp trap pictured above. [[spoiler:The first game positions it so that you won't die unless you jump, the second game inverts this (you have to jump in the right spot to activate an invisible block that stops the Thwomp from hitting you), and the third game puts a pit below you (though, like the first game, the text box will pop up before you fall off the screen).]]
* CraniumRide: Spin jumping on dangerous enemies to pass over spikes or the like. Taken even further in 3, where an entire level is centered around riding on top of a Mega Mole while avoiding the scrolling scenery.
* DevelopersForesight: The extreme difficulty of the game seems to be designed so that even with save states, you will rip not only all of the hair from your head, but from at least 40% of the rest of your body as well. The Start-Select exit code is removed for all three games, so you cannot go back a level and snag any power-ups or Yoshi.
* EverythingIsTryingToKillYou: As with most PlatformHell games.
%%* FakeDifficulty
* {{Foreshadowing}}: In Kaizo Mario 3, the beginning message includes the words in English "PROJECT [[spoiler:-KILLING PEACH-]]". Guess who you face in the first castle.
* GameMod: Obvious.
* GrimyWater: Gray water is death.
* GuideDangIt: The sequel mixes it up a bit by having a level consist not of ridiculous deathtraps, but a convoluted, [[RubeGoldbergDevice Rube Goldberg-esque]] series of actions required to access the end of the level. Taken UpToEleven in the penultimate stage of Kaizo Mario World 3.
* HailfirePeaks: Special World 4 combines TheLostWoods flavour with BigBoosHaunt foes.
* HardLevelsEasyBosses: Compared to the hell that's come before, Invisible Bowser is relatively easy. Underwater Bowser is another cakewalk. [[spoiler:Hammer-Throwing and Fireball-Spitting Bowser is FAR more difficult though not as difficult as the hell you been through.]]
* HelpfulMook: Accidentally Assisting flavor. See CraniumRide.
* InstantWinCondition: Subverted, especially with the KaizoTrap. If you fall off a cliff to nothingness after finishing a level in ''Super Mario World'', you will still die; the original game was just kind (or smart) enough to not put cliffs there. Kaizo, not so much.
%%* InvisibleBlock
* KaizoTrap: The TropeNamer, of course. One infamous level requires you to trigger a P-Switch near the end of the course so that Mario doesn't fall into a pit of lava and kill himself during the victory scene.
* LeapOfFaith: Required way, way, ''way'' too often.
* LuckBasedMission:
** The first special stage requires the player to perform a leap of faith over (essentially) a BottomlessPit and hope that a fish jumps up at the right place for them to bounce off and continue. There is no set pattern to how the fish appear at all, meaning the jump comes down to pure luck.
** Special world level 2. 100 seconds and, while possible, you should probably save scum as Pokey moves in random directions and could waste time you NEED to beat the level in time.
* NintendoHard: The ''easy'' levels. The rest are PlatformHell.
* OneHitPointWonder: Enforced; many passages are only big enough for the small one-hit Mario to pass.
* OddballInTheSeries: The third game is the only one with custom palettes, custom graphics, custom sprites, and even custom music.
* PlatformHell: Most of the game, although taken to further and further degrees by imitators.
* PressStartToGameOver: The title screen opens with a Thwomp crushing Mario, and quite a few levels try to kill you a couple seconds after they start.
* SaveScumming: Beating this hack (and others of its ilk) "legitimately", without using emulator save states, is virtually unheard of.
** Has actually gotten more and more popular as the game has turned into a well-known speedrun, with many people now have beaten the games without save states. In fact, one has even beaten the game ''[[https://www.youtube.com/watch?v=Jv5Lpzzjf6s deathless]]''.
* SchmuckBait: [[spoiler:The last bonus level has a huge pile of blocks, a leaf stuck underneath it, and a finish line. Guess which is the SchmuckBait.]]
* SequelDifficultySpike: The second game just [[DarkerAndEdgier increases the hellishness]] of the first one.
* SlippySlideyIceWorld: Hope you have your ice sliding skills perfected, these games exploit the mechanic's difficulty for all its worth.
* {{Speedrun}}: Especially the Tool Assisted kind. Some imitators are actually made purely for Tool Assisted Speedruns.
** Famous ''VideoGame/SuperMarioWorld'' speedrunner ''[[https://www.twitch.tv/dram55/profile Dram55]]'' has completed the first Kaizo game in [[https://www.youtube.com/watch?v=Jv5Lpzzjf6s 14:29]], deathless. Yes. ''Deathless''. He's also finished the second game in [[https://www.youtube.com/watch?v=DHs5Ub08NLA 33:31]].
* SpikesOfDoom: As Munchers and normal spikes, and in great quantity in all levels.
* TemporaryPlatform: Used throughout the mod, including the infamous KaizoTrap.
* TrialAndErrorGameplay: 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.
* VideoGameRemake: ''[[http://www.youtube.com/watch?v=fs1L5Pix-gM Kaizo Mario Advance 2]]''. How shall the gameplay of Luigi from the GBA version work with these levels?
* SerialEscalation : How insanely difficult will ''this'' stage be? Practically gets turned into an artform.
* ShoutOut: The third level of the first game is called Cerulean Cave, a reference to a location in ''Franchise/{{Pokemon}}''. %% Someone should make sure this is the same in Japanese.
* YankTheDogsChain: The reward for beating the Special World in the first game is a Feather, so you can actually avoid the OneHitPointWonder rule... [[spoiler:only it's stuck in a place that is impossible to escape, since the blocks are too high for Mario to jump over. You cannot exit the level either by using Start-Select.]]