This is the completed One-Pixel challenge. Complete destruction requires patience as it takes time for the more distant structures to reach flashpoint. Since the simulation tends to be chaotic, it doesn't always work, but it will.		
				
			
							pixel
							challenge
							powder
							bomb
							city
							destroy
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	Comments
		
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			Actually, it didn't take very long at all in my case, a stray firework set off the distant buildings. +1, I couldn't manage to complete the challenge :P