This hack is dedicated to Glitchcat7 on Twitch. He's a well known kaizo Mario player, so, along with the 71-exit game, there are 11 additional exits featuring kaizo levels.
Included in the .zip is the kaizo game, and the full game plus the kaizo game, for those that wish to play both versions without having to download both versions. For those who wish to speedrun this hack, take a look at the readme for instructions on the % categories.
The slowdown in the mole area isn't fixable, I've tried. No idea why it slows down in the truck area, never did for me. I'll fix the chuck obstacles in a future update, its not that big of a deal currently. The disco shell part you've done is intended, I believe. You want to get him out of there before you move on. Thanks though for all the feedback!
The slowdown in the sky city room has been fixed, but now it shows up here and here. One of the first Chuck obstacles has been fixed in the tutorial level, but the rest are still low enough to kill it.
A suggestion: add another spike below me here and maybe some other obstacles so the disco shell obstacle isn't fully obsolete.