Featured in Head Trip
This image wiggles when you scroll—or does it?
You move, I move.
These sudoku puzzles only use 1s and 0s. Can you crack them?
There’s only one correct answer for each grid.
Give your brain a workout with these unique number puzzles
Called “Sums,” they were invented by an engineer.
These two red dots are actually identical. Here’s how
It’s all thanks to the Ebbinghaus illusion.
Stare at this blue dot long enough, and it’ll disappear
It’s all thanks to your brain being energy efficient.
Logic problems to challenge your bored brain
They’ll make the time pass lightning fast.
Solve the Monty Hall Problem with simple math—if its psychology doesn’t trip you up
What’s behind door number one?
Solve the famous water puzzle from Die Hard 3
Tackle this brain teaser with a vengeance.
These skulls look purple and orange. They are both red.
The pigments morph because of the Munker-White illusion.
Can you count all the triangles in these images? (Hint: There are more than you think.)
These polygons contain multitudes.