It's been a long time since I posted here, but I never stopped making the marios! I figured I'd post a bunch of my best levels for you guys. For the most part, I try to keep my levels in the moderate area of the difficulty spectrum: Not putting you to sleep but (hopefully) not frustrating.
From newest to oldest!
Follow the Fuse!
This one has Mario keeping pace with bob-ombs on their way to clearing a path for him! It's intended to be engaging without being overly difficult; anyone should be able to clear it if they keep at it. It features a modest bonus area for observant players to find. Also, the level only utilizes the lower half of the creation grid.
Don't let those bombs get away from you!
POW Industries
I wanted to see what I could do with POW blocks as the main element. It loosely follows the theme of being in a factory. I tried to pace it with the main challenge areas punctuated by short moments of levity and lower stakes. It teaches the player things they'll need to make use of later and features a "boss" room where you're mainly fighting the room itself.
Metroid Abridged
I make no claims that this is a very good level, but it's my attempt at a whole Metroid game condensed into one course, taking inspiration from my hazy memory of the first game with some elements from Super tossed in. I tried to make Mother Brain look more dangerous than it actually is because that's an annoying fight in the real game. Thwart the space pirates and get back to your ship!
The Lost City of Golems
A collaborative effort with a friend. He did most of the above ground area and I did most of the underground section. We shamelessly took an idea from a "Mecha Bowser" level he showed me on youtube. I think it turned out pretty swell!
Big Boo's Little Secret
A brief ghost house level playing just a little bit with the 'parallel worlds' shtick that people like to do.
Prison Break - Rescue Yoshi!
One of my favorites! I made it when we got the key & skewer update. It's a nonlinear "dungeon" style level with an emphasis on presentation and a light narrative. Mario gets himself captured in order to stage an escape and get his buddy out of there!
Feeble-Footing Canyon
My only level designed specifically to be challenging. Guide Mario from one end of a gaping canyon to the other, and keep moving because there's not much in the way of footholds along his path. Good luck!
Go For Yolk
A level playing like a series of minigames. Keep pace with the flying egg to unlock the door forward. It wasn't intended to be an Expert level, but it seems most of the 100 Mario Challenge players had some trouble with it. Maybe Gaf will fare better?
Da Vines are Divine
A series of vine-climbing challenges that ramp up in difficulty as you go, and a bonus area with a fun way to access it. What awaits you at the end...?!
Sabotage the Mole Fleet! W/Chkpt
One of my early efforts that I advertised in this thread a long time ago. It remains one of my most long and ambitious levels. It badly needed checkpoints back in the day, and refreshing this level was the first thing I did when that patch came. You must somehow sabotage each ship to proceed to the next, eventually wreaking havoc on the mother ship's engines. Gaf's feedback taught me a lot about bug-testing as I refined this level over and over.
Yoshi's Got Talent!
Another level previously shared here. This one showcases the full range of Yoshi's abilities and features a twice-branching path giving the level sort of a "double helix" structure. The first branch will only be found by the curious. The boss can be slogged through head-on or quickly dispatched with a callback to a puzzle found early on.
Suit Up
The earliest of this list. It's just a power trip, which people seemed to like because it's my most starred level by far. There are three hidden one-ups, each harder to find than the last.
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There you go! There's plenty more among my uploads but a lot of the ones I left out are made by friends and/or are experimental or joke levels. I will be bookmarking some levels in here for later play, glad to see our community for this game is still ticking.