So far, I have done just 2 levels, but maybe in the future I will do other levels as well...
All my levels are made using the Version 1.3 of SMBX and despite being uploaded only now, they were made by me in the past years (I can't remember the precise date).
I was planning to use them for an episode called "Star Quest" but I never completed it and now the project is canceled (who knows, maybe I will continue it again in the future, for now it's just dropped).
My difficulty rating is:
Tutorial
Very Easy
Easy
Medium
Hard
Very Hard
Experienced players only
Hell
Let's start with the levels:
Grassland
A very short level, that was meant to be the beginning of the adventure.
Difficulty: Easy

This level is not final, there are a couple of things that I want to correct, anyway it's still fully enjoyable; there is a toad who is just a memo for me, all what he says is not important for the player and it will be removed soon.
Download: https://mega.nz/#!rghmWCSb!3rpC3jyh01Dq ... fZuOnCENto
Peach's Castle
This level is special, I won't spoil anything, I'll just say that it has some secrets and some dialogues. In the canceled episode it was going to be a level that moved the story forward, a story level.
Be sure to complete the level twice, one normal (0 stars) and one with at least a star, since the levels has 2 different exits and one of them requires at least 1 star.
Difficulty: Medium

Well, to be honest, this was supposed to be the real firts level, but despite I tried to make it as easy as possible, it's still a bit complex for a beginner, so I think that if I will ever restart the project, I will put an introduction world that works as tutorial/training before this level... I want to make an episode that's accessible by any player.
Download: https://mega.nz/#!KhBUwIoB!ybeCtaOpEGQT ... pumRdU50ss