Guessed by @UnderwaterFunktown
So, Portal 2 finds itself outside of the top 15 for the first time ever. I just looked back through its position over the years and actually, it had stayed exactly in the same spot (#13) for the past three years, and was always in the top 10 before that. I don't really know what happened, I guess this is just kinda.. fading? I still have so many fond memories of this, of playing the main campaign several times, of going through the co-op campaign with my brother in what might've been the last game we spent plenty of time on together, or even trying my hand at making custom stages and giving up when I played through other people's much better ones. Portal 2 is amazing, it really is. Just feels a bit more distant now than a few years ago, I suppose.