the last thing you'll ever use was a huge clue man XD put it together with the others....btw when you are using it you don't actually know you are .........
there is a house with a bulb inside
and there are 3 switches outside
one of which is for the bulb
the room is completely sealed with only one door
u have to find out which switch is for the bulb but u can only go inside once
so how will u do it?
this is quite an easy one so I don't think u'll need any hints