Gin Rummy

How to play: draw from the stock or discard pile, then discard. Collect sets (three or four of a rank) and runs (three or more in a suit, ace low). Knock when your unmatched cards total 10 points or less — go gin (no deadwood) for a 25-point bonus, but watch out: if your opponent's deadwood matches or beats yours, they undercut you for 25. First to 100 wins.