Go to the site version for smartphones.
5. Select the image you want to add instead of the question mark. (Note: each of the 8 upper pictures here is drawn according to one of the 3 rules. It is necessary to define which of the 6 lower pictures matches any of the 3 rules.)
  IQ test. Fast and free online iq test # 4 with answers and solutions. Question # 5. Select the image you want to add instead of the question mark.
 

Explanation:
If the drawing consists of 4 lines, then all angles are equal to 90 degrees. If the drawing consists of 5 lines, then all angles are not equal to 90 degrees. If the drawing consists of 6 lines, then this drawing contains angles of both 90 degrees and not 90 degrees.