On the evil science map if you go at the end of the main corridor you will find a lift to get to the upper level floor 2 i assume. In other maps you will find several locked doors with keypads on them n if ya cant find the code in blood on a wall or in a note or pda you will have to hack the code for them like the doors that have random codes on them that are inside the office after clocking out with the punchomatic machine. Use these two first but if one door code works ieg 2nd room being 8053 all the other rooms will be the same variant. 
				
			
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