The gold key is also usually behind lots of traps usually within a single room designed specially for that key and has no other exits. Next time keep an eye of such plates right infront of the entrance door for some reason they are hard to spot and i have been trolled by it few times myself till i finally discovered that it is not a bugged closed area but simply hard to spot floor plate puzzle. A gold door can only appear once within the labyrinth while there can be multiple silver doors. 
				
			
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