This puzzle is linked to the previous " Should Dr. (Indiana) Jones do it?" puzzle
After walking thru the rain drenched tropical forest Jones finally arrived at his destination. A stone building with what looked like 4 similar looking doors and a veranda in front of them. The stone looked like dark granite. The doors looked metallic, brass or bronze may be. There were no windows.
He walked into the veranda and saw a Tape Recorder in the corner. He turned it on. The deep voice said:
**Welcome again Doctor Jones. I have been expecting you. If you have come looking for the Chinese Golden Dragon, you have found the place. It is stored safely in one of these 4 rooms, in a cabinet on the back wall. All you have to do is to push open the door of that room, walk across, open the cabinet and take the treasure. So simple.
Well, there is a tiny bit of problem Doctor Jones. I have made this a little bit more challenging than the last time. Last time you only had to deal with 2 rooms, one with the acid shower and one safe. You were lucky enough to guess the right one. But this time, there are 4 identical looking rooms. Three are death traps and, the fourth is safe. The treasure is in the safe room.
Now all rooms look the same. Same walls, ceilings and same closed cabinets. They all have holes in the walls and ceilings. Yes Doctor Jones, the holes have a deadly purpose of course!
Randomly, Room 1 is the Acid room, and is plumbed with concentrated acid shower. Once you are in the room, acid spray from all directions coming thru the holes will drench you. Not fun.
Room 2 is the Bullet room. Once you are in the room bullets will fly from the holes and I am certain that some of them will definitely hit you.
Room 3 is the Furnace room. Once inside the holes will breathe and spray ultra-hot gas from all directions which will melt your skin. Not fun either.
Room 4 is the room you want Jones. Safe room. Pick that room, walk across, open the cabinet and take the treasure.
Now I remember that last time there may have been a slight miscalculation on my part about the acid shower. This time I have corrected the problem. Also just before you arrived I have tested all the death rooms to make sure everything works.
Now all you have to do is guess the right room, open the door, run to the cabinet, take the treasure and go back thru the open door. The door is on a timer. It will remain open for 20 seconds only and will then automatically close and lock. The sensors for the acid, the bullets and the hot gases are triggered the moment you crack open the doors but the actual showers start after 2 or 3 seconds. Oh and Jones, once you open any door the other doors are locked and you cannot get in.
Good luck Doctor Jones. Hopefully this will be the last time we talk.**
Jones thought about it. He could open a door and wait a few seconds to watch if there are death showers. But then the other doors will be locked. And 20 seconds is not a lot of time. He did not bring anything with him except his whip and some food.
The he walked across the veranda and stopped in front of one of the doors. He was just about to turn the handle when he stopped and slowly let it go. He walked to the adjacent door and turned the handle slowly. He then entered the room.
Why did he do that?