'Nautiball' is volleyball played on a big floating platform in the sea. The contestants play in groups of five.
The group begins by picking a card out of a box to find out which team they'll be playing against. The opposing teams, also of five members, include Emerald Guards, a women's volleyball team and women in swimming costumes.
The first team to reach three points wins; so the contestants need to beat their opponents in order to move on to the next round.