"The player must pilot a biplane through a series of barns in the shortest time possible while dodging windmills, weather vanes, and geese. Bumping into anything slows down the plane for a couple of seconds, increasing the overall time.
There are four levels of play determined by the game select switch. Game 1 is Hedge Hopper (10 barns), game 2 is Crop Duster (15 barns), game 3 is Stunt Pilot (15 barns), and game 4 is Flying Ace (25 barns). In the first three games, the course layout of barns, windmills, and even geese do not change, making it easy to memorize the layout. Game 4 is the only game with a random course."
Source: Wikipedia, "Barnstorming (video game)," available under the CC-BY-SA License.