This game is similar to "Mastermind."
The leader picks a four-digit number, and the students try to guess it.
When a student makes a guess, he is given feedback in the following manner:
      (1) BULLSEYE -- a correct digit in the guess and in the right place.
      (2) HIT -- a correct digit in the guess but out of order.
      (3) MISS -- No digit of the guess is anywhere in the number.

Here is an example:
Let's say the leader picked 7375.
Here are the guesses and the responses:
  Guess     Response  
  0124             MISS  
  3567             Three HITS  
  5376             Two BULLSEYES & 1 HIT  
  7375             Four BULLSEYES -- Game over 

Click here for another version of Hit, Miss, and Bullseye