Abstract: A device for aiding a player playing the game of blackjack which includes an outer housing with a first and a second labelled window. The first window is labelled to indicate that a symbol for the dealer's up card value is displayed therein. The second window is labelled with a plurality of indicia signifying the possible values which are assigned to the player's card combinations. The device also has a carriage rotatably mounted inside the outer housing, and a chart is displayed on the surface of the carriage. A set of symbols which stand for the dealer's up card appear on the top of the chart, and a number of other symbols which indicate proper decisions by the player appear on the remainder of the chart. A knob at either end of the carriage retains the carriage in the outer housing and allows the player to hold the device and rotate the carriage by manipulating one of the knobs using only one hand.