Liked the cell stage of Spore, but wanted more depth? Gotten merrily lost in the graphical programming puzzles of SpaceChem? Love the "can I manage to build this...?" creativity of Kerbal Space Program? Crescent Loom is the very first biologically-realistic nervous system simulation game. It lets you — in a hands-on, mad-scientist way — tinker with everything from neurotransmitter to the ecological niche of an animal. So dive in and maybe — just maybe — by poking around with these simple creatures you'll figure something out about how your own body ticks.
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It's a spore like where you build in depth creatures but it's a little too in depth to keep me with it, and not very clear how to do what you want