Our brains can do amazing things—but in the right circumstances, they can also fool us. Try the brain tricks and teasers below and find out what’s going on in the brain in each one. If you’re looking for more brainy fun, try BrainHQ.

Curve Blind
Are they the same size and...
Ninio’s Extinction Illusion
How many black dots do you...
Scrambled Text
Try to read it.
Missing Letters
How many did you count?
The Hermann Grid
Can you count the black dots...
In Depth
Which monster is larger?