Videos that provide viewers with brain teasers/mental puzzles. These may consist of problems dealing with the arrangement of matchsticks, coins, and other items. May include pencil drawing games, optical illusions, hidden images and "Find the Twin" problems.
Questions answered by this video:
Do you see gray areas at the corners of the square in this optical illusion?
Currently 2.0/5 Stars.
The pattern of black blocks on white background in this picture really plays with your vision.