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:
Which wedge is a darker shade of gray in this optical illusion?
Currently 2.0/5 Stars.
In this image with one gray wedge on a white background and the other on a black background, one wedge appears darker than the other.