Let's all admit that last one was really hard. I will personally admit I have no idea how to solve it. There might not even be a solution.
So I'm making another one. Hopefully this one will be easier.
You are in a room with walls of stone. There are three doors. One leads to Heaven, one to Hell, and one to the mortal realm.
The first door is guarded by an elf in shiny armor and the second in a similar elf. The first elf has a gold spear and the second elf a silver one. The third door is guarded by an elf in shiny armor with a sword and shield.
One of the three will answer any question with a lie. One of the three will answer any question with the truth. One of the three will kill you if you ask him a complicated question. And he has a very liberal idea of the world 'complicated,' so be careful. If he answers your question, he will always lie.
You can ask three questions to them before they tell you to either choose a door or die. The goal of this game is to reach Heaven, although reaching the mortal realm is also good.