Search engine giant Google honoured the 155th anniversary of Pony Express, the iconic mail delivery service, on April 14 with a new Doodle game

The interactive game shows how significant this primitive communication system was, as far as the 19th century gold miners and their families back East were concerned, CSMonitor noted.

Googlers can help a pony deliver mail across America by clicking on the Wild West-themed Doodle, according to Times.

In the game, players rode around collecting letters that are dispersed all over the ground. The challenge comes with Cacti and other obstacles getting in the way and trying to throw the players off their horses. Each time a player is knocked off, a couple of letters are lost. If you play it long enough, you'll eventually be crossing streams and more.

The Pony Express is an essential element of western stories and modern tales, despite the fact that it only lasted a year and half. Nevertheless, by filling the existing gap between far-ranging travel and the widespread use of the telegraph, it served an extremely important purpose. Eventually, it proved to be a financial nightmare for its creators. Their efforts, however, have not been forgotten.

Google said that it was so excited to share the Pony Express doodle that it asked Nate Swinehart of the animation team to tell a bit more about the history of the Pony Express and also document the doodle process.

Check out the video below:

"The Pony Express felt like a great game concept to us at Google," the doodle design team said in a statement.

The design team further added that making time-based games is not new to them as they have made similar ones in the past. The idea of the game was simply to avoid obstacles and aim for the ultimate 100-letter delivery goal.

In its prime, Pony Express was a complex network comprising of 100 stations, 80 riders and around 500 horses. What's worth noting is that only one mail delivery was ever lost despite the treacherous route.