They're not kidding. I wasn't able to make it past the seventh level -- the top score is an unbelievable 773.
You get 20 seconds to knock down an arrangement of dominoes, squashing a tomato (I think) in the bargain. If you clear all the dominoes, you get a time bonus. For each one still standing, you lose a second on your next attempt. You can elect to pass on any of three stages.
To restart the game, click on "Quit" in the upper right of the Game Over or high score screen. Warning: Music and sounds.