I feel that Kaizo Mario World is one of the best hacks to impose the "kusoge" feeling of games on Super Mario World. One of the kusoge definitions is a game which is comparable to excrement due to unplayable difficulty, whether by poor control, poor design, or simply developers who enjoy watching their audience squirm. This one nails that third kind.
See
http://www.japangameloser.com/2009/01/22/japanese-for-gamers-101-kusoge/ for a definition and a few examples.
Essentially, Kaizo Mario World is the distilled frustration of our youth. To our younger and lesser skilled selves playing Mario for the first time, some levels may as well have been this intentionally sadistic as we were grounded for hurling the Nintendium alloy controller through a thin layer of drywall. To give it a less romanticized view, it's a bit of mockery and a bit of celebration over the hellishly hard games of the past which were certainly not designed with the intention that everyone should be able to beat it before giving up. It also gives a bit of nostalgia such as how Yoshi must be sacrificed to the lava pits in order to survive, that ultimate act of betrayal on Mario's part after Yoshi was the only reason he could pass a significant part of the level earlier. I'll give that the hack appears rather lazy and often really is. I'd say that being clever and being lazy are not mutually exclusive. The idea of an invisible Bowser is hilarious. The difficulty is entirely artificial, yet it fits perfectly with the kusoge theme in that it doesn't have to make sense, it just has to be grossly unfair and infuriating, but someone, somewhere can beat it so that means you can't give up just yet.
I may be seeing art where others see crap, but I think this particular hack isn't unfair in a way where they want it to be impossible, but rather designed specifically to demoralize the player as much as possible while the design shows it is entirely possible to beat the level if it is done perfectly. While a standard player with save states would create something that looks vaguely similar, the ease and flair on display manage to mock even expected solutions. I'll admit to having a soft spot for this kind of thing done well, and this is a shining example of what a kusoge hack is all about. I agree that hacks should be carefully examined and that most "hell mode" difficulty hacks are horribly unwatchable. I also think that this hack along with a few original SMB hacks really show off what the kusoge idea is all about in caricature. Yes vote, very pleased to see this one up for consideration at the least.