Maya Ball Court
From WikiRaider
A Maya Ball Court (wrongly named Mayan Ball Court in its Journal entry) serves as portal to the Maya underworld Xibalba in the level of the same name in Tomb Raider Underworld.
The rules to the game played on these ancient ball courts are lost to history, but it's believed that it was played frequently and sometimes for high stakes, as the losing team was sacrificed to the gods. It is of particular interest to me, as it was believed that the Mayan underworld of Xibalba was underneath a ball court.
Tomb Raider Underworld, Journal Entry "MAYAN BALL COURT"
The Maya ball court holds many of the treasures that can be found in the Xibalba level. Lara needs to search every corner thoroughly to find all secret vases.