Once the door is closed, there's no way to open it, as the doorway seems to disappear.

Once both of them are inside, the hallway they end up in turns blood red. It doesn't translate to scents and it seems it's not actual blood, just the color.

On the walls there are some marks left by others who have braved these halls. They're roman numbers. Numbers I, III and V go to a path towards left, while II, IV and VI got right. Then there's a mysterious X on the middle path.

Which way would they like to head?