"It's the best of UNO matching by color and number, mixed with an exciting stacking game. Stack blocks by color, number or command -the taller it gets, the harder it is! Game play combines the strategy of UNO with a physical task requiring patience and finesse. Use the action blocks against opponents to get an advantage! UNOStacko makes a great gift for 7 year olds and up. Includes 45 colored blocks, loading tray and instructions."