4digits: 4digits (A Guess-the-number Puzzle Game) 4digits: 4digits: 4digits is a guess-the-number puzzle game. It's also called Bulls 4digits: and Cows, and in China people simply call it Guess-the-Number. 4digits: The game's objective is to guess a four-digit number in 8 times. 4digits: 4digits: 4digits: 4digits: Homepage: https://sourceforge.net/projects/fourdigits/ 4digits: https://github.com/fossilet/4digits 4digits: