"The object of the game is to find the one domino that, when pushed, will cause the entire set to topple and squash the tomato. The object of the game is to find the one domino that, when pushed, will cause the entire set to topple and squash the tomato. You begin the game with 20 seconds on the timer, which is the time limit you have for finding the correct domino. Use the left mouse button to click on the domino you want to start toppling. "