Most of the way through Arkham Knight now. I don't know if it's because more of the game is at ground level because of the focus on the Batmobile but finding the Riddler trophies is more of a hassle than it was in the previous games.
I'm also pretty close to finishing MDK. One of those games I missed when it was new because my PC wasn't good enough to run it.
I spent a lot of time playing Dino Eggs yesterday. A classic Apple II/C64 game in which you have to rescue dinosaur eggs and babies from your germs by taking through a time warp to the future (wouldn't they just die from the germs in that time, too?). When you read the instructions, it sounds over-complicated - knock down boulders, pick up eggs, take them to time warp, make a fire to keep the dino mom from stomping on you, etc., but it comes across easily enough when you start playing and it's very addictive. The C64 version has better music, but the Apple II version is the best overall because it plays more smoothly.