If you are a fan of the game "Cows and Bulls", here is a small facebook messenger bot I made that you can play against.
The idea is that the bot will think of a 4 letter word and you are supposed to guess the word. You get 15 chances to guess. And for every guess, you get a feedback on how many bulls and cows are there in your guess.
Bulls are alphabets in your word that are also present in the bot's word at the exact location. Cows are alphabets in your word that are also present in the bot's word, but at a different location.
So if the bot's word is TOAD and you guessed BOAT, you will get 2 bulls(for the O and A) and 1 cow (for the T). So strategize and find patterns.
To get started, use messenger and message this page or Click on the "Message" button at the home page