go play minecraft.
Circuits can be used to Make some complex things in-game. And Also ADD some command entities that trigger a circuit or series of commands. When It comes to Logic Gates thenThis is a little discription of what they are:-http://whatis.techtarget.com/definition/logic-gate-AND-OR-XOR-NOT-NAND-NOR-and-XNORHope it gets implemented so We would build machines(simple to complex) in-game
Here, it's doable. http://www.quake2.com/qworkshop/tutorials/logic.htm