Google Doodle Celebrates 155th Anniversary of the Pony Express With a Game

Google celebrates horseback letter carriers with a game in today's doodle.

— -- Giddy up!

Embedded in the doodle is a game that gives the concept of the Pony Express a digital spin, allowing players to guide their galloping horses along a trail collecting letters while avoiding any collisions with cacti.

The mail delivery system carried tens of thousands of letters but was made obsolete by the invention of the telegraph 18 months later.