21 cars on a 7×9 lot. 60 seconds on the clock.
21 cars left
You have 60 seconds, starting at your first tap. A bump costs 3 seconds.
Drive the cars out in this order: 2, 3, 1, 9, 10, 14, 16, 17, 12, 4, 5, 6, 11, 15, 8, 18, 13, 7, 19, 20, 21.