Stereograms (3D images) use optical illusions to reveal hidden 3D pictures — and that's what makes them so fun.
The problem with fixed patterns, though, is that you end up memorizing the answers.
This app turns it into a quiz — guess the hidden letters inside each stereogram.
Every round is randomized, so you'll never know the answer in advance.
A great way to take a break when you are tired from your phone or computer.
What's new (v1.1.0)
New mode: Spot hidden math equations and solve them!