The One with Brain

You walk through a strange door with a brain icon on it. As you walk inside you found yourself in an even larger room with many different door.

You walk around to check some of the doors and found the similar composition to the previous room's doors. All new door contain a different symbol on it. None get you interested and you want to go back to the previous room, but you found the door missing.

You have no choice, but to go through one of these strange door.