You have to play through and beat (undefined amount) of "shitty levels" from the Shitty Demon List. (https://gdshittylist.asemnada991.repl.co).
(range of shitty levels can vary, for example, top 50 or higher.) Kind of a challenge for any decent player that can easily beat easy - hard demons. (maybe insane? no idea. can't beat them myself)
Consider this or don't. After all, it's just an idea.