Capoeira is an Afro-Brazilian martial art, game, and culture created by enslaved Africans in Brazil during the 17th Century. Participants form a roda (circle) and take turns playing instruments, singing, and sparring in pairs in the center of the circle. The game is marked by fluid acrobatic play, feints, subterfuge, and extensive use of groundwork, as well as sweeps, kicks, and headbutts. Throughout the game, a player must avoid a sweep, trip, kick, or head butt that may knock him or her on the floor. Less frequently-used techniques include elbow-strikes, slaps, punches, and body-throws. Capoeira has has evolved from one main form, known as "Capoeira Angola", into two other forms known as "Capoeira Regional", and the ever-evolving "Capoeira Contemporânea"