16 cars on a 7×8 lot. 45 seconds on the clock.
16 cars left
You have 45 seconds, starting at your first tap. A bump costs 3 seconds.
Drive the cars out in this order: 2, 1, 3, 4, 5, 7, 6, 10, 12, 13, 14, 15, 9, 8, 11, 16.