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what are the logical properties of opening doors? is it simply collecting cubes and trial & error? same question for control panels (the one in the reactor room wasn't working for me, then all of a sudden, it did; i had the same amount of cubes between that time)

The sector controllers keep their doors shut until cleaning routines have done their job in that area. Control panels are reacting to specific command inputs from your flash memory. These commands can be copied from the dodecaeders on the podests. :-)