Hello,
I am trying to complete the Prerequisites Exam to obtain the course certificate, however after failing python tasks 2 and 3 repeatedly, with 3 always ending up in an infinite loop, I ran the scripts myself and noticed that upon perfect completion of task 2, the Turtlebot does not end up facing the opening and as such task 3 will not begin with the Turtlebot at a corner adjacent to the opening, it will never end up with the bot moving out of the room. I think there is either a problem with the instructions or perhaps the simulation itself, restarting it did not work.