I think I have about two chapter of this in me every few years. This is my favorite Zachtronic puzzle game in a lot of ways, I think the core mechanics are very cool and the look of it is spectacular, but it's so so easy for me to get frustrated by the more complex puzzles. It takes so much effort to just figure out how to get atoms in place to be bonded properly it makes me want to curl up and take a nap. I salute people who will go all in on optimizing even the toughest puzzles, but I need to take another long break before tackling the last two chapters of the campaign.