Mind Reader is a one-player game, you against the computer. The object is to guess the number the computer is thinking of. The number can be 2 to 5 digits long. You have 20 guesses or a time limit. Also in Nim you play against the computer. You have a choice of 3, 6, or 9 piles. The objects in the piles are numbers, 1 to 15. The player who takes the last number off the screen wins.