UNO Show 'Em No Mercy is a brutal and unforgiving version of the classic UNO card game. In addition to the standard action cards like Skip, Flip and Draw 2, No Mercy includes Draw 6, Draw 10, Skip All, Discard All and the new Wild Color Wheel – a card that forces the next player to choose a color and draw until they get a card of that color.

In addition to the new action cards, many popular house rules have been incorporated into the current rules. Stacking is legal. 7s trade and 0s pass hands. And when you can't play a card, you have to draw until you can play.

But the biggest change in UNO Show 'Em No Mercy is the Mercy Rule. If you have 25 or more cards in your hand, you will be kicked out of the game.

UNO Show 'Em No Mercy comes with 168 cards (compared to 112 in regular UNO).