I've decided to put Super Toads 3 on hiatus until further notice, and have instead decided to make two ROM Hacks of Super Mario World. As the title of this topic suggests, this was inspired by an old Flash game called Super Mario Bros. Crossover (which featured not just characters from Mario, Zelda, Metroid, Ninja Gaiden, Blaster Master, Contra, Castlevania, and Mega Man, but also two difficulties that would alter the layout of stages and add or remove enemies and hazards, with the stage layouts being those of Super Mario Bros., Super Mario Bros.: The Lost Levels, and the Japan-exclusive Super Mario Bros. Special). The alterations will add and remove stuff not used in the original levels (like Big Steelies in Front Door/Back Door in the Hard Mode hack and solid ground in the dreaded Power Balloon section of Tubular in the Easy Mode hack). While the hacks will be individually-made, they will be in a single .zip together, complete with Readme. The only things not to be altered include the boss fights with five out of the seven Koopalings, the Reznor boss fights, and the final showdown with Bowser. The only other changes beyond the altered difficulties involve Bowser's body and Yoshi's arms. Expect these mods to be released sometime in 2022.
UPDATE: I forgot to mention that the Magikoopas will have the correct arrangement of blue shades in both hacks.