Word String is a free word puzzle game that’s easy to play, but challenging to master. This word game has the same goal as other popular word puzzle games, and that is to find all the words you can in the puzzle. However, this time you’ll be doing it in a string of letters, which makes it more challenging than other games. The difficulty in this game increases as you move forward, and the more you play, the more new words you’ll learn. This is a brain game that can be played offline and on your mobile device, which makes it the perfect game to play when you don’t have an Internet connection.