Can you solve the control room riddle baffling the internet?

Another day on the internet, another riddle for you to solve.

This time, rather than being a commuter on their phone or a bored Twitter user flicking through as they wait for their friend, you are your nation's top spy.

In this riddle by TED-Ed, you are infiltrating the evil empire's headquarters to find the control panel to switch off their death ray.

Your intelligence services tell you their headquarters is a pyramid with ten floors.

The top floor has one room, the second-top floor has two rooms, and so on and so on.

The control panel is hidden behind a painting which is on the highest floor that can satisfy the following conditions:

  • Each room has exactly three doors which connect to other rooms on that floor - except the control panel room which only connects to one.

  • There are no hallways or stairs to worry about.

  • There's no floor plan and you'll only have time to search one floor - so you need to choose the correct one.

Watch the full video, below and scroll down for the answer:

















The answer is the 6th floor from the top.

Like us, you may have done a scribble and impetuously decided on the fifth floor - however this does not work as the room which leads the control room would have four connections.

Something you may have overlooked in your haste.

Picture: YouTube/Ted-Ed/Screengrab

However, the 6th floor does work.

Picture: YouTube/Ted-Ed/Screengrab

Damn maths.

Why can't the intelligence services just tell us the floor to begin with?

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