Portal Detective

Youre alone, in the depths of space. The building youre in is made up of a series of square rooms containing unusual ornaments and varied lighting. The rooms are otherwise identical. Each doorway from one room to the next seems mundane at first, but then you encounter one that seems... off. Maybe when you go through you dont end up in the room you expected, or light doesnt seem to travel through the doorway correctly. Thats because that doorway is actually a portal. As you successfully identify ...