When the display time has elapsed, the revealed objects will be hidden momentarily before the full set of 24 objects are presented simultaneously.
Your task is to tell the computer which of the objects you had previously been shown.
To do this you move the pointer around the screen - placing it on each of the objects that you have just seen and pressing the left button - 'SELECT'.
When you have selected an object the computer will indicate whether you are correct or not by displaying either 'YES' or 'NO' in place of the object. The program will continue until you have either selected all the correct items or made enough errors to suggest that you are making wild guesses.