Well, I spent the last few days just messing around with the Challenges and putting off doing the Joker Boss fight because I knew how easy and fast it would be. Sure enough, just finished it. Seriously, how can this level be THAT easy compared to any of the other Boss Fights? Turning the game on and loading it was harder than this fight. Sigh.

Off to find the riddles and all the other things I need for 100% completion.

Also, I didn't get one achievement during Hard mode till the very end when I finished kicking the Joker's ass. Wow. Pfftt!!