SpaceChem is an obscenely addictive, design-based puzzle game about building machines and fighting monsters in the name of science! Take on the role of a Reactor Engineer working for SpaceChem, the leading chemical synthesizer for frontier colonies. Construct elaborate factories to transform raw materials into valuable chemical products! Streamline your designs to meet production quotas and survive encounters with the sinister threats that plague SpaceChem.
I'm at a point in this game where I can play this for very long amounts of time. This is a good thing. I get my next puzzle, close the game in disgust ("HTF am I supposed to do that!?!") then proceed to spend the next few hours or days thinking about how to solve the puzzle. It's a game you keep playing, even when you're not playing.
Then it gets worse, you finally find a solution, but it seem inelegant. You are using too many components, it's taking way too many cycles. And the process begins again. You spend another few hours or days thinking of how to improve your reaction.
This game has taken over my life!
The interface is a little bit clumsy, but other than that it truly is one of the most engrossing puzzle games I have played since TIM.