More specifically, a moderately difficult puzzle game I can play on my phone or computer, doesn't require fast reaction times, and doesn't use the language part of my brain in case I need to have a conversation while doing it. I'm playing through Monument Valley right now and I've been loving it, but I'm almost done the third one and don't think I can wait for the fourth. Obviously, good graphics would be a plus, but I'm here for the puzzles themselves.