This may just be the most difficult puzzle in the world. It’s not because it has a ton of pieces, in fact it’s actually quite small, but the shapes the pieces form are guaranteed to blow your frickin brain off. I do have to say that though that putting that last piece in must feel fantastic!

It’s called the Pento T, made by Jean Claude Constantin, and it features some very odd non-traditional puzzle pieces. All of the pieces, in fact, look almost identical to each other, making it one of the hardest puzzles to figure out.