As I was looking at the different categories of this game, I wondered about what other categories can be done. The suggestion I had was single world speed runs, where a person has to complete every level in a world. It doesn't matter if you complete the level by the regular or secret exit, only that you complete all the levels on the world map.

It's best to do this on a completed save file, and you need a save file with all the coins collected to do an attempt on world 9.

Those already exist. If you click "leaderboards" in the top left there will be a level leaderboard option.

Cads 100% world 1... One more left

If youre looking for ILs, yeah those already exist but your Idea in a full Game Run would be Something Like All Levels NG+, i dont See this category Being added anytime soon since it doesnt really vary that much from all Regular Exits

There are Any% and 100% IWs (Individual Worlds) and ILs (Individual Levels) you can speedrun. The drop-down where “Leaderboards” is should allow you to see “Individual World RTA” and then there’s both Any% and 100%.