Gameplay
On each turn, a player must:
- draw either the (up card) top card of the discard pile, or the (face-down) top card from the stock pile, and discard one card from his or her hand onto the discard pile.
Players alternate taking turns until one player ends the round by knocking, going Gin, or until only two cards remain in the stock pile, in which case the round ends in a draw and no points are awarded. The game ends when a player reaches 100 or more points (or another established amount).
Read more about this topic: Gin Rummy