The  game  is a matter of quick visual  recognition  and 
     retention in which you play against the micro.

          Cards  are placed face down on the screen and  you  turn 
     them over two at a time to reveal their number.  If they  are 
     the  same  you add their value to your  score.  If  they  are 
     different they are placed face down again.

          Extra features like Swap cards swap your score with  the 
     computer's.  Times signs multiply your score  by two,  but  a 
     division sign halfs it.