Your friends have built a room with puzzles. To get out of it, you need to collect all five keys. After a couple of days entreaties, they agreed to let you in. When you were inside, then closed the door behind you. Now you have proved yourself against dozens of puzzles and riddles. Chances are they equipped it also traps. During the time you are not limited, but it is not necessary to sit for a long time, after all those wishing to visit this place very much.