Tiến lên (Vietnamese: tiến lên, tiến: advance; lên: to go up, up; literally: "go forward"), also known as Vietnamese cards, Thirteen, American Killer, or Jamal Patel in India, is a Vietnamese shedding-type card game devised in Southern China and Vietnam.It is similar to Zheng Shangyou, which uses a specially printed deck of cards, Big Two, and other "climbing" card games popular in many parts of Asia. Tien len, considered the national card game of Vietnam, is a game intended and best for 4 players.