If you checked my time spent in games from last year, you'd note that I spent the most time with two games: Team Fortress 2 and The Binding of Isaac. I never expected to play one within the other, though. As spotted by PC Gamer, I will now have the opportunity to do so, as some intrepid modders have created a Binding of Isaac map for the custom Super Zombie Fortress mode.
Sure, you can't download the map for your own purposes yet (it's still a work in progress), but if you hop on the Slag Gaming Super Zombie Fortress server, there's a chance you'll catch it in their mod rotation. Until then, go ahead and watch them take out Mom's Heart, a Husk, and a whole ton of robots in this demo video. Once it's done, it'll have "probably two more bosses" and 20% more stuff. Whatever that means.