Anyways, what is this level about? Well, first off, it's not really 1 level, it's three merged together, but transitioning between 'em is seamless, so I decided, still counts.
Toad (the person you are playing as) has just woken up, disoriented, hungry, and most of all, completely bored. He leaves his house (or his crib, as he calls it) and begins to walk into town with his crew (that consists of two people: himself, and also himself.) to hit the "club" and maybe hit on a few of the chicks there. Unexpectedly, a Mushroom Retainer blocks his way, informing him the princess has been kidnapped. This doesn't particularly interest Toad, but after a bit of trickery on the Retainer's part, he begrudgingly walks off to the call of adventure.
And what an adventure it is. In this tutorial level, Toad fights the mafia that wants his money, learns the basic controls of SMBX to help him save the princess, and even meets the son of two demigods from hell that want to wipe out his universe on his way to save the princess.
If you want to help Toad, then hit this link right now:
(Just a quick note: This level will only run in SMBX 1.4.4)