Guess a number!
Everyone knows this game. Someone picks a number from 1 to 100 and the other person has to guess it. Now, you can do it with the computer, even when no one else is around! There are two modes, you guessing the computer's number and the computer guessing your number. The buttons are even labeled like a conversation (i.e. Instead of "Computer number" it's "You go".)
Note that I did not allow the computer to set high scores. High scores can only be set by the user.
Extra bonus: It works online!