UNO Show 'Em No Mercy is a brutal, ruthless version of the classic UNO card game.
In addition to new action cards, many popular house rules have been included in the actual rules. Stacking is legal. 7s swap and 0s pass hands. And when you can't play a card, you must draw until you can play.
But the biggest change in UNO Show 'Em No Mercy is the Mercy Rule. If you ever have 25 or more cards in your hand, you get kicked out of the game.