The aim of the Turn Based game is to draw to the best of your ability so that your opponent can guess correctly, thus reaching the highest number of rounds possible. Whenever you guess correctly you'll receive a chest with different prizes.
The type of chest you get when you guess your opponent's drawing will depend on the level of the game. That's why it's so important to do your best. The drawings will be easier to guess and you'll obtain more chests.
Keep in mind that the game doesn't end. If you or your opponent don't answer, the score of the game will be zero.