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.