Play as the Joker was originally PS3 exclusive, nowadays it's also available on the Mac version, and the Return to Arkham remasters. There is also a way to mod him and the other missing challenge maps into the PC version, although I don't remember how off the top of my head and can't seem to find the guide for it at the moment.
I would strongly recommend joining our Discord server if you have any further questions, that is generally the best place to get information about speedrunning the games. Here's the invite link: https://discord.gg/uC8RVdk6QF
I've just updated the autosplitter to add auto splits for all the backtracking segments in 100%. Everything in the 100% and 100% Glitchless splits that was previously marked as "[Manual]" is now automatic. Also, the Sewer backtrack split will now happen when you leave the sewer instead of when you r
