Bob's 27 is a simple game to practice your doubles. Starting with Double 1 and working your way through to the Double Bull, you throw all 3 darts at that particular double. You keep track of the amount of doubles you hit and record them. Hitting doubles adds that score to your score, however, if you fail to hit one of that particular double, you lose that much from your score. Achieving a positive score by the end is the goal but if your score goes negative, you lose. To make things easier for tracking, we've added a little widget below.