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a smart robot

activate the battery to start moving

a kinda modified robot that kill's people (and probably robots too)
the main thing is his movement.
when he is moving in some direction and then detect's an enemy, he stops and begin firing till' an enemy dies
if he killed the enemy, he would start moving again.
and so on

this system is kinda random, sometimes after finishing a sucsessfull murder he can stay on and he would not move.
you would need to make him move again by activating battery again tho.

that was actually pretty simple to create and pretty cool to look at