Game Jolt has been hit by Nintendo with multiple DMCA takedowns.
The site was ordered to remove 379 different fan-made games on their service, and it seems Nintendo targeted titles that used assets from their games, such as visuals, audio, or some form of code. However, we do not know if Nintendo requested the removal of completely original fan games.
The hundreds of games that have been removed now spit out 404 error pages when you try to access them, and it looks like they are gone for good.