This sounds a bit suspicious though. If we're confident that the neurons aren't complex enough to understand Doom, how can they be said to be complex enough to play it? Playing a game is a loose term but it seems difficult to say that it is playing something that it can't comprehend or interact with. By analogy, if there was a CNN between me and a game of Doom people would say "roenxi is cheating with an AI aim-bot", not 'roenxi is playing Doom".
The whole thing is still pretty cool though. Hopefully the neurons are having fun, I'm sure we all wish them what happiness they can muster.