A Mesoamerican ballcourt is a large masonry structure of a type used in Mesoamerica for more than 2,700 years to play the Mesoamerican ballgame, particularly the hip-ball version of the ballgame. More than 1,300 ballcourts have been identified, 60% in the last 20 years alone.[when?] Although there is a tremendous variation in size, in general all ballcourts are the same shape: a long narrow alley flanked by two walls with horizontal, vertical, and sloping faces. Although the alleys in early ballcourts were open-ended, later ballcourts had enclosed end-zones, giving the structure an -shape when viewed from above.