* The Activity where you can play with computer offline.
* If you want to play with your friends it has feature to connect with your friend online.
* You can play with your friend in real time with the feature of interacting with each other by the mode of text.
* It has Help section if your are playing for the first time.
* Code that checks for possible number of bulls and cows.
* For Real time communication used FIREBASE if you are playing with friend.
* Code to generate hint in any random position of a four digit number without any biasness.
* Used Audioplayer for music effect.
* Used Firebase Authentication to authenticate users and add to the database.
* Used Hashing to check if you already guessed that number or not.
* Popup dialog if you win or lose.
* Toast if you already guessed that number.
* Generating random number every time with random probability.
* Having feature of registration by your Email.
* Toast if your online friend is not locked the secret number.
