Gin Rummy is one of the most popular card game. Play Gin Rummy against the Android. Gin Bonus 25 points. Big Gin Bonus 31 points. Undercut Bonus 25 points. Oklahoma Gin. Oklahoma Gin is a derivative of Gin Rummy. The value of the first upcard determines the minimum count at which players can knock. If this card happens to be a spade, all scores in the deal are doubled.