After approximately eight years in the making, another unauthorized fangame which had became too popular has been noticed by Nintendo, who was then forced on 2020-9-21 to submit a debatable DMCA claim (intended to be used against copyright violations) to actually defend their trademarks.
But at the center of the debate is not just any game mod or imitation, but rather a pornographic parody of the Super Mario series created by Ivan Aedler, called Mario is Missing: Peach's Untold Tale.
Astute readers may have noticed that the first half of the name is in fact the name of a licensed Mario game, followed by that of a major character of the series, giving Nintendo a legitimate reason to complain against this Flash game despite having flagrantly abused an inappropriate instrument to do that.
For people wanting to find a copy of the game, it seems to still be fairly available at the time of writing in both SWF and Windows EXE versions; the final release is then version 3.48, which in the latter format is 53055271 bytes large and has a SHA-1 of AB0FA013436603AA6A289631AF3408B0CCF68AEC.
The creator plans to continue development of the game after replacing the offending intellectual property.
2019 interview with the creator (contains images for mature audiences only)