You don't realise just how good a gaming year it's been until you look back at all of the games you actually played. From physics puzzlers to ninja simulators, 2012's library was full of interesting, creative, unique experiences.
Have you played Nine Hours, Nine Persons, Nine Doors? If not, you really should. It's a wonderful visual novel-slash-point-and-click adventure with a tendency to make your brain explode, and I recommend that everyone take the time to experience it.