Fermat's room

I remember I once had a journey because of the movie called Fermat’s room. It tells the story of four persons that are trapped in a room and must solve riddles to survive. The riddles took me on a journey especially one that said: In the false land everybody lies, in the true land everybody tells the truth. You are on a room trapped and there are two door one leads to salvation and the other does not. One door is guarded by a guard from the false land and the other is guarded by a guard from the true land but you do not know which guard if from the false land. You are allowed to ask one question and then you must choose a door. What do you ask? This riddle was given to me in twelve grade and I could not solve it. This time I went on a mental journey imagining myself in the room until I found the solution which was ask what door the other guard would tell me to pick and then choose the other door. The one from the false land was going to lie and tell me the wrong door while the one from the true land was also going to tell me the wrong door. Every character in this movie is taken through an internal journey while solving the riddles and finding out how closed each other are related. Also it puts the audience through an internal journey if you take personal like myself and try to solve the riddles on your own. The same time happened with Einsteins zebra puzzle which only 1% of the population can solved it. It took me 2 hours to solve that puzzle but at the end, the journey was worth it.