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These robots are designed for grunt work. Unfortunately, grunts don't have any brains and right when the robotic miners were going to unlock the resources hidden beneath the crust, all the machines shut down. Send down some activated robots into the depths of this mining tunnel and break through the collection of dormant bots by connecting the similarly colored blocks and destroying them. Don't let the machines pile up or you'll lose all your chances to unlock new bots and bombs.
Use the mouse or the arrow keys to move around the blocks and connect them three or more similarly colored blocks.