@JoCr2
  @JoCr2
P̒̌͒sͥ̇y̔cͣ͌̍rͫ̔ȏw̾͆̇̑ | Key coin DUPLICATION glitch: BREAK levels in Super Mario Maker 2! (Also:How to play my SMM1 levels!) @JoCr2 | Uploaded April 2024 | Updated October 2024, 3 hours ago.
Most clips seen in this video are from my twitter (twitter.com/JoCr2). Here are the others used (includes the original 3 sightings of it happening):
youtube.com/watch?v=R0F30iM0HKo
twitter.com/Cloon_dog/status/1777621733123797126
twitter.com/jo10385720/status/1400948616550764544
twitter.com/bbmariomaker2/status/1779813800365236639
Thanks also to Knflrpn, Domthewiz, & F. Buffalo for some info used here, and Fritzef for uploading the levels provided in the list below for me.
(I couldn't find the original file or creator for this Mario remix, but if I do later I'll mention them too.)

GameXplain's video on using Pretendo for Wii U (no modding required): youtu.be/La1NYVvvnKU

Here are seven SMM1 level codes from Psycrow on Pretendo (all either glitched or modded), and links to see CarlSagan42 / GrandPOOBear playing them:
1) "Forsaken Clock Tower" [CBBC-0000-000E-8DD2]: youtu.be/KKIm3mFk-6U?t=2775
2) "Journey to the Sphinx" [EEB0-0000-000E-8DD0]: youtu.be/L5FvsHgF1hE
3) "Journey Home: Curse of the Sphinx" [83B4-0000-000E-8DCE]: (Same video as above)
4) "Mole-in-my-Hole Mining Town" [BC8E-0000-000E-8DCC]: youtu.be/FGMorv5_pq8?t=152
5) "Journey to Space: Sphinx's Maker" [6BE2-0000-000E-8DCA]: youtu.be/1z5RWkVQpjo
6) "The Madman's Library" [3C4E-0000-000E-8DC8]: (Same video as above)
7) "Museum of the Forbidden" (Just an old glitch level created for an event) [BC35-0000-000E-8DC6]: youtu.be/wddS6piNkAU?t=3416
[Edit] Someone said in playing "The Madman's Library", they weren't able to jump above a vine/conveyor at the top of the Mystery area; and in "Journey Home: Curse of the Sphinx", things weren't spawning from clown cars like in his play either. I don't know why that'd be, but if a level doesn't match Carl's play above, you could always complete the rest by downloading and using Edit mode, or edit a shortcut into the section itself.

(For modded Wii U users) The video about my 4 Glitch Template levels: youtu.be/nT8DsPk1P90

My SMM2 discord where we research this stuff: discord.gg/UZTJxHM

Any updates will be put in a pinned comment below!
Key coin DUPLICATION glitch: BREAK levels in Super Mario Maker 2! (Also:How to play my SMM1 levels!)THANK YOU~!  (Psycrows Super Mario Maker retirement dance party)3 glitch demo levels - Super Mario Maker 220 clips of old Psycrow experiments (Super Mario Maker)50 interesting setups from Japanese tweets - Super Mario Maker 2Miyamoto Rick Roll (generated with AI)Make & share co-op puzzle levels: Super Mario Maker 2New Black Hole technique   possible on any Wii U (Super Mario Maker)Psycrows Game Builder Garage game: Street UrchinTips & glitches in BlockDrop - Tetris style Youtube gameAnimal Crossing New Horizons - Out of map boundaries GLITCHGame Builder Garage inspiration?  25 setups from Labo Toy-Con Garage!

Key coin DUPLICATION glitch: BREAK levels in Super Mario Maker 2! (Also:How to play my SMM1 levels!) @JoCr2

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