Circle

Math. Geometry.

Your partner at a romantic candlelit dinner shows you the following curious map, and whispers, "Germany's three biggest cities lie on a CIRCLE." Are you intrigued? What's your response?

(Meme going around – credit to the original creator wherever they are.) pic.twitter.com/QV5LmTtckm

— Cliff Pickover (@pickover) December 26, 2025

I am Guilty

(via Nag on the Lake)

Find the Missing "L"

(via Give Me a Sign)

Tweet of the Day

What happens to the missing square?pic.twitter.com/ahuhUfE4hs

— Wonder of Science (@wonderofscience) November 2, 2024

I'm sure you've seen this puzzle before, but have you ever had the solution explained?

The Two Doors

The problem with logic puzzles is that there are too many details to remember. If you really want to solve one, you should have a pen and paper handy. Or you could handle it the way Chris Hallbeck does with his simple but relatable characters.

Tweet of the Day

Thoughts? pic.twitter.com/MQ1ZinwpsE

— Massimo (@Rainmaker1973) March 24, 2024

Tweet of the Day

How many ladders will be used to reach the top? pic.twitter.com/0XknTDkMMw

— Science girl (@gunsnrosesgirl3) March 14, 2024

I said, "All of them?" But maybe she meant the fewest number of ladders necessary. You might want to work it out on your own, but here's the answer. After I looked hard at this, there's really only one way to get to the roof.

Once again, the full picture doesn't come through on the embed. So here it is.

 

Tweet of the Day

pic.twitter.com/UDOiWBNKWv

— Science girl (@gunsnrosesgirl3) March 7, 2024

I know the answer. Leave your opinions in the comments. Some people assume that some people live with each other because of the house shapes, but that's not the case- the houses are different colors.

 

Oh, here's the whole picture, since Twitter doesn't want to show us without clicking through. 

 

Easy Peasy

(via TYWKIWDBI)

The Time-Traveling Car Riddle

Ready for a brain teaser? In this puzzle from TED-Ed, you are the protagonist in a Back to the Future scenario. You have to go back in time to set somethings right, but apparently you are not meant to get it right, because you from the future, uh, your future, is also there. This time travel paradox can be a bit confusing, but I think you can find your way out of it, at least theoretically. We really don't have time-traveling Deloreans. If you want to solve the puzzle on your own, stop the video at two minutes in. They will give you the answer and explain it thoroughly after that. Whether or not you solve the puzzle on your own, I think we can all agree that this would be a great set up for a full-length movie.

Maze

You can't do this one without cheating. (via reddit)

Minions and Bananas

Illustrator Gergely Dudás makes puzzles featuring recurring characters and something hidden among them. This week he saw the new movie Minions: The Rise of Gru , so he drew a puzzle featuring a legion of minions -and three bananas. Can you find the bananas? If you want to give up, click to the right for the bananas. (via Boing Boing)