Find the one domino that, when pushed, will cause the entire set to topple and squash the tomato. You have to locate it in 20 seconds - or less, depending how well you did the last time.
If you pick the right one, you get more time on the clock for next time, otherwise you get a second knocked off for each domino that's still left standing.
Tips: You get three "passes" per game (by clicking on the bottom-right tomatoes) for arrangements that look just too complicated.
Play Domino pressure!