How can I go back to play earlier levels?

To go back and play earlier challenge levels is not set up for easy access. When you open the Parking Jam app, you have to click on the icon above the house in the upper right corner of your screen. It looks a little like the outline of a blue ribbon from a fair. This will allow a white area to appear with the blue challenge numbers scrolling. It stops with the highest level 200, on your screen. You have to swipe from left to right slowly to return to an earlier challenge. Click on the Challenge you wish to play again. If you don't have an ad block app, the parking lot will appear after the ad has played.