When down to one card, players don't yell, 'Ay Caramba' -- they yell, 'UNO!'. The special 'Woo-hoo! rule adds a fun twist, where a player may be safe (Woo-hoo!). or may have to add cards (D'OH!). Unique patterns on each card help identify the color(s) on that card, allowing players with any form of color blindness to play!
eBay